exam Maths Puzzle Numerical Ability

Find the error, then correct it. After driving 50 miles an hour for n hours the distance traveled was 50 n miles.

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exam Other Question

Find the volume.
Use 3.14 for PI
V=PI r^2 h

There is an upright cylinder, on the top is 15in. and on the side is 40in.

A. 1200in^3

B. 1884in^3

C. 3768in^3

D. 28,260in^3 How do I do this problem?

One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. I nned to find the larger number.
Thank you, Jamie