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Lubov Fominskaja [6]
4 years ago
11

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 th

eir three times was 62.6 seconds, how long did it take each girl to run this race?
Mathematics
1 answer:
yulyashka [42]4 years ago
6 0

Answer:

X= Gracie

X+7.2=Hilda

X+7.2-11.4=Janell

(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

Step-by-step 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

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