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Math: What temperature will it be at 10 O'Clock?
The temperature on a cold day rose at a constant rate from -18F to 34F from 8 am to 12 noon. What was the temperature at 10 am that day? Can anybody tell me how to solve this problem?
what i have done so far was to add 18 to 34 to get 52. then i divided 52 by 5 to get 10.4 about 11. then i just added 11 to -18 and so on until i got to 10 O'Clock in which i got 4. Can someone tell me if i was on the right track?
Answer choices;
A) -5F
B) 8F
C) 13F
D) 21F
1 Answer
- MathMan TGLv 79 years agoFavorite Answer
You're close.
Your method is ok, your numbers are a little off.
From 8 AM to Noon is 4 hours not 5,
so the temperature is rising at 52/4 = 13 degrees per hour
10 AM is two hours past 8 AM,
so the rise is 2 * 13 = 26 degrees
-18 + 26 = 8° F which is choice B.
P.S. 10.4 rounds to 10 not 11,
but in a case like this you should not round at all
during the middle stages.
Only at the end, if at all.
If you do it in the middle, you add in the "round off error"
at every stage along the way.
