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Mathematical Cross Multiplying Sample Questions
Answer To Cross Multiplying Question #1
The correct answer is C. We know that M/G = Z/x with x being the gallons needed to travel Z miles.
Using cross multiplying you have the following formulas:
M Z GZ
---- = ---- Mx = GZ x = -----
G x M
The same thing will work if you had numbers instead of letters. Lets say that M = 400 miles and G = 10
gallons and Z = 200 miles. You can probably figure this out in your head. If a car can travel 400 miles
on 10 gallons of gas, it will only need 5 gallons to travel 200 miles. You get the same number using
cross multiplying.
400 200
----- = ----- 400 x = 2000
10 x
2000
x = ------- x = 5
400
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