exam Maths Puzzle Numerical Ability

1. which is the largest set of ratios in the set: 4/5 over 1/3, 7/8 over 1/4, 7/9 over 1/6, 2/3 over 1/5, 9/11 over 1/4 2.which is the largest: 1 3/4 over2/3, 2 1/2 over3/4, 2 1/8

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exam Other Question

Solve:
5[3(7-t)-4(8+2t)]-20 <= -6[2(6+3t)-4] There is a pool of water. One Pipe empties the pool in 45 minutes. The other pipe empties it in 67.5 minutes. How long would it take to empty the pool if both pipes were used together?

This is from a worksheet my son brought home.