book Maths Puzzle Numerical Ability

a car stereo system thet regularly sells for $425 is on sale for $318.75. find the discount rate.

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book Other Question

A father is 4 time as old as his son. 5 years ago the sum of their ages was 70 find their present age. a) An automobile travels m miles in h hours. At this rate, how far will it travel in X hours?