book Maths Puzzle Numerical Ability

-x + y = 13 for y Can you help me find the number for y? I thought the answer was 20 but I was wrong.

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book Other Question

SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE

A. (-1,2) AND (4,Y)
B. (X,-4) AND (-9,-12)

PLEASE HELP ME!!!!!!!!!!!!!! what is reduced fraction of 8 18/24