exam Maths Puzzle Numerical Ability

25x = 91 - 16y
16y = 64 - 16x

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exam Other Question

How do you find the length of arc measurements? This is the problem I am trying to resolve. My answer keeps coming up 4.7 but the answer sheet says 21.5. Please help me understand why my answer is incorrect. Thank You!!!!

162/360 x 15.2(3.14)=
what is the answer to (2a-17a+a*a*a+6)/(a-3)