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A boy gave 2/5 of his marbles to his best friend Jessie, and 1/4 to his sister Jenny. If he had 14 marbles left , how many did the boy have to start with ?

Respuesta :

sqdancefan

Answer:

  40

Step-by-step explanation:

The remaining fraction is ...

  1 - 2/5 - 1/4 = 20/20 -8/20 -5/20 = 7/20

If 7/20 of the boy's marbles is 14 marbles, he had 40 to start with.

  (7/20)·marbles = 14

  marbles = (20/7)·14 = 40 . . . . . multiply the above equation by 20/7

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