exam Maths Puzzle Numerical Ability

nail polish remover is a mix of water & acetone. How much acetone must be combined with a solution that is 28% acetone to make 24 oz of a 58% solution?

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exam Other Question

One bus traveles 20 km/hr faster than another. While the slower bus traveles 280 km the faster one goes 440 km. Find the speed of the faster bus.

a) 35 km/hr
b) 45 km/hr
c) 55 km/hr
d) 65 km/hr
e) none of these Solve. 10x - 1/4 = 9x + 3/8