book Maths Puzzle Numerical Ability

a) An automobile travels m miles in h hours. At this rate, how far will it travel in X hours?

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book Other Question

a car stereo system thet regularly sells for $425 is on sale for $318.75. find the discount rate. 1.) 3x+y=15
y=3

2.)3x-2y=12
-y+9=x