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Janell ran a race 11.4 seconds faster than Hilda. Hilda ran the race 7.2 seconds slower than Gracie. If the average (mean) of their three times was 62.6 seconds, how long did it take each girl to run this race?

User Manuskc
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1 Answer

21 votes
21 votes

Answer:

Answer:

X= Gracie

X+7.2=Hilda

X+7.2-11.4=Janell

Explanation:

(X+X+X+7.2+7.2-11.4)÷3=62.6

(3x+3)÷3=62.6

3X+3=187.8 (I arrive at 187.8 because I multiple 62.6 by 3)

3X=187.8-3

3X=184.8

3X/3=184.8/3

X=61.6

Explanation:

GRACIE X=61.6

Hilda X+7.2=61.6+7.2=68.8

Janell X+7.2-11.4=61.6+7.2-11.4= 57.4

User PKlumpp
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