exam Maths Puzzle Numerical Ability

if 5^21*4^11=2*10^n what is value of n

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exam Other Question
The sum of 2 consecutive odd integers is 92. find the numbers. Find the missing length of the right triangle?

I cant draw it, but it says 17 on the downward slant and 15 across the bottom.

possible answers are:
a) 9
b) 8
c) 6
d) 7

Thank you so much