3 years ago

Devaughn's age is two times Sydney's age. The sum of their ages is 21. What is Sydney's age?

Mathematics

1 answer:

levacccp [35]3 years ago

4 0

Answer:

The age is 7

Step-by-step explanation:

Devaughn's age is two times Sydney's age

and the sum of their ages is ? Let’s Sydney's age is X, Devaughn's age is (2X+X=21)

Therefore 3X=21

Rearranged is X= 21 divide 3

Therefore Sydney’s age is 7

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<h3>How many minutes did it take him to run 10.5 miles?</h3>

The given parameters are

Speed = 3.5 miles per hour

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Time = Distance/Speed

So, we have

Time = 10.5 miles/3.5 miles per hour

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Hence, the minutes it takes him to run 10.5 miles is 180 minutes