exam Maths Puzzle Numerical Ability

the math club bought 16 graphing calcaulators for $765. the super x model cost $40 and the super zx costs . how ,many super zx calcualtors were purchased?

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exam Other Question

A 6-passenger plane cruises at 180 mph in calm air. If the plane files 7 miles with the wind in the same smount of time as it flies 5 miles against the wind, then what is the wind speed? The perimeter of a rectangle is 76 cm. The length of the rectangle is eight more than four times its width. What are the dimensions of the rectangle?