Question

a boy has given 7/12 of his marbles to his friends and his left with only 20 marbles find how many marbles he had with him initially

Answer 1

Total number of marbles = 12/12
No. of marbles he gave to his friend = 7/12
No. of marbles left with him = 12/12 - 7/12 = (12-7)/12 = 5/12
But, no. of marbles left with him = 20 marbles

According to question,

5x/12 = 20
x = 20 * 12/5 = 4 *12 = 48
x = 48

Thus. total no of marbles with him = 12x/12 = 1(48) = 48 marbles.

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