The red sea is widening at a rate of 1.25 centimeters per year. how many years will it take to widen another 812.5 centimeters?
600
650
750
800
812

This is a simple math problem, and for that, the rule of three can be used.

Explanation:

The rule of three in this case will work like this, we have three informations on the question, and we're searching for the fourth one, so by that let's do the rule of three below:

1,25cm - 1 year

812,5cm - X

After that we multiply 1,25 with X and 1 with 812,5, the result is this:

1,25X = 812,5

X = 812,5/1,25

X = 650

So the answer to the question is 650 years to widen another 812,5 centimeters.

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