exam Maths Puzzle Numerical Ability

One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
5
7
17
34

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exam Other Question

R(r1 + r2) = r1r2, for r2 Crickets chirp at 59 degrees F 76 chirps per minute. At 65 degrees they chirp 100 times a minute. Write an equation expressing chirping rate in terms of temperature. Then predict chirping rate at 90 degrees F.