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40% of the airplanes were hydroplanes. If 660 were hydroplanes, how many were not hydropons?

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40% of the airplanes were hydroplanes.

If 660 were hydroplanes, how many were not hydroplanes?​

SOLUTION

If 40% of the airplanes were hydroplanes.

Let x represents the total number of Hydroplanes.

So that 40 % of X = 660

40/ 100 x X = 660

2 / 5 x X = 660

2X / 5 = 660

cross- multiply, we have:

2X = 660 X 5

2 X = 3300

Divide oth sides by 2 , we have :

X = 3300 / 2

X = 1650

Total number of Hydrophones = 1650

Those that are Hydrophones = 660

Those that are not Hydrophones = 1650 - 660

= 990

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