book Maths Puzzle Numerical Ability

solve for the indicated variable. area of a trapezoid

solve for b1:A=1/2h(b1+b2) b1 is top line of trapezoid
b2 is bottom line of trapezoid

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book Other Question
I just need to know if I am right or not. My question is Reduce the fraction
-20t^5 u^2 v^3
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48t^7 u^4 v

I think the answer is

-5v^2
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12t^2 u^2 How many different seven digit numbers can be made by rearranging the digits 3053354?