book Maths Puzzle Numerical Ability

i need help with these problems as well please.

10 divided by w-8 subtracted from 12 over 8-w the answer i got was 22 divided by w-8????

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book Other Question

Please help me solve this geometry problem: There is a shape consisting of 5 sides,the left side is straight and measures 10 cm, across the top measures 6cm, the right side goes do find the last digit for the below mentioned problems

2^3^4^5
17^27!^37!
(36742)^123!*(34767)^28!
562^421+894^642*398^983