book Maths Puzzle Numerical Ability

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

2/5 = /10

2 over 5 equals some number over10

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book Other Question

-4(-p)(-q)= 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