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Hello, I'm generally good at learning languages. I already speak 4 European languages (Greek, English, Spanish, German) and I want to pick up a different language now. I was thinking one with a different writing system. Which one of these do you think is the easiest to learn without a teacher, using free online resources?

Chinese, Japanese, Korean, Russian or Arabic?

Thanks in advance!

Assume we can use digits 1-9, at most once each, in a sequence of numbers with a maximum length of 9. In each sequence we count how many "runs of 10" there are, i.e. how many sets of consecutive digits sum to 10. For example, the sequence 1234 has a count of 1, because there is one run (1+2+3+4) that sums to 10 and the sequence 3528 has a count of 2 (3+5+2 and 2+8 both sum to 10). The question is:What is the minimum length of a sequence that contains 4 runs? What is the minimum length of a sequence that contains 5 runs? Is it possible for a sequence to contain 6 runs?

My intuitive answers are 7 (6415237 contains 4 runs), 9 (648253791 contains 5 runs) and no, 6 runs is impossible. Are these correct? Can you help me find a simple explanation/proof? Thank you!

We have a square-shaped garden. Each side of the square is 3.5 meters long. We want to plant flowers in the garden, but every flower must be at least 1 meter away from each other. What is the maximum number of flowers we can plant?

Please explain your answer. Thank you!

We call a natural number a "remarkable" one, if it is a composite (non-prime) number that is not divisible by 2, 3 or 5. For example, 49 is a remarkable number, since it is divisible by 7 (thus it's not prime) but not divisible by 2, 3 or 5.

The question is: how many remarkable numbers are there up to 10,000?

Note: There are 1,229 prime numbers up to 10,000.

Please explain your answer. Thanks in advance!

A fast food reastaurant only sells chicken wings in buckets. Small bucket contains 6 pieces, medium bucket contains 9 pieces and big bucket contains 20 pieces. What is the largest number of pieces you cannot order?

In math terms, what is the largest integer that CANNOT be expressed in the form 6a+9b+20c for some integer values of a, b, c?

Please explain your answer. Thanks in advance!

There is a swimming pool with a boat inside. What would raise the water level more: throwing a coin in the pool or throwing a coin in the boat? Please explain your answer.

In some country, the number plate of each car is an 8-digit number, where each digit can be a number from 0 to 9. Every number plate must be have at least two different digits in the same place from every other number plate. What is the maximum number of number plates that can exist in this country?

Hi, I have to read some data from a file of the following format:

<data1>

<data2><data3><data4>

<data5><data6>

Data contains either integers or strings. I'm having trouble to read data3 for example, if it's a string, because i don't know how to ignore the symbols <,> and the data that follows until the new line character. Can you help?

I am writing English lyrics for a song I composed, but I'm not a native speaker and I'm not sure if this phrase is correct:

Love brings obsession and obsession makes scared.

Is this use of "make" acceptable, without including an object in my sentence? If not, could you rephrase it in an acceptable way? Thank you!

Hello everyone, my last name is Karamalegos (I'm from Greece) and my friends recently gave me the nickname "Karamalegolas", mixing my name with the name Legolas, a hero of "The Lord of The Rings". So I thought it would be a good idea to upload a profile photo on Facebook showing Legolas, but having some of my own facial characteristics. Unfortunately, I don't know how to use Photoshop or another photo editing software that would enable me to create such an image... If I'm not asking too much, could someone make this photo for me, please?

I want to be able to move apps to certain places, for example to put all games in the first sheet of the apps menu, music apps in the second one etc. But for the time being, my apps are listed in the order I downloaded them, and whenever I delete an app the others stay where they were, leaving a gap. Is there a way to change positions of the apps to solve these problems?

I want to be able to move apps to certain places, for example to put all games in the first sheet of the apps menu, music apps in the second one etc. But for the time being, my apps are listed in the order I downloaded them, and whenever I delete an app the others stay where they were, leaving a gap. Is there a way to change positions of the apps to solve these problems?

I'm looking for a site that contains exercises on verb tenses (all of them: past, present and future, simple, continuous and perfect). It would also be great if these exercises were of many types: multiple choice, fill in the gap, crosswords etc. Thanks a lot! 10 points for the best answer! :)

A friend of mine wants to learn English vocabulary and I want to help him. So, I thought he could do it through songs, instead of studying and learning by heart lists with words. He's mainly into rock music. Do you know any good and famous rock songs that contain nice words in the lyrics?

Thanks in advance! 10 points for the best answer :)

Why do we say "I am in London" but in present perfect the preposition changes to "I've been to London"?

Also, which of the two questions is correct?

Have you ever been to London? / Have you ever been in London?

What's the correct preposition? Please explain.

I've been ____ London twice.

a. in

b. to

c. at

I need a photo (intended for profile picture in Facebook) with the following quote:

The most important relationship in life is the one you have with yourself, or

The most important thing in life is to be ok with yourself, or something similar.

I've done some online research but I can't find a photo with such a quote and nice background and font.

10 points if you find one for me!

My cousin uploaded a photo of me a week ago and I want to make this photo my profile picture. However, it has already got some likes and comments which I wouldn't like to lose. Is there a way to make this photo my profile picture without downloading it and uploading it again, so that all likes and comments won't go? Thank you!