exam Maths Puzzle Numerical Ability

y=3
x+y=24

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exam Other Question

A car rental company charges $25 a day plus $.10 a mile. If I rented a car for 3 days and was charged $105. For how many miles did I get Charged? If I actually drove the car 250 miles, did I get charged the right amount. 2x=y=1
2x-y=5
please helpme solve this equation by graphing.i have another problem.a sailboat travels 20miles downstream in 3hrs.it returns in4hrs.find the speed of the sailboat