book Maths Puzzle Numerical Ability

Find the measure of each unknown angle in triangle ABC if angle a=(42-x)degrees
and b= ( 9x - 32)degrees
Please find A B and C

I am not even sure where to begin! Yikes

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book Other Question

I am not sure how to solve this problem, please help me!

2/5 = /10

2 over 5 equals some number over10 I am having trouble figuring out this problem. I know i should use the same base in all but do not know where each number should go, please help.

3( logb m-3logb n)