Meme

I'm re-learning ratios for a new job which requires a numerical reasoning test (been many years since I last did advanced maths) and I'm totally stuck on this practice question:

A, B and C shared some stickers in the ratio of 3:1:4. After C gave 40% of her stickers to A and B, A had 90 more stickers than C and the number of B's stickers increased by 70%. How many stickers did C have at first?

320

240

400

160

No matter what I do I end up with x=150 making 4x 600 (and that's ignoring the 70% increase - I plain can't make that work). Where am I going wrong? So frustrating that I can't solve this... I'm a neuroscientist but feel totally stupid right now!

I've recently been experiencing a vibrating pain in my middle back when walking and googled it to see if it was worthy of the docs and got a bit of a shock. Turns out its a symptom of MS, now this alone wouldn't bother me except 3 years ago I had a series a neurological exams about a weird electric pain in my arm that lasted about 5 months. I had weakness, tingling and pain. That mysteriously cleared up and thought nothing of it. About 4 months ago I had a weird tremor in both arms/hands that lasted a week.

Everything clears up randomly and never returns and I've never linked them before. Does anyone (preferably those with MS or medical knowledge - not just google) know if this is worth mentioning to my GP or is it just good old fashioned hypercondria?