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Three boys shared some oranges The first receiv... - JAMB Mathematics 2005 Question

Three boys shared some oranges. The first received 1/3 of the oranges and the second received 2/3 of the remaining. If the third boy received the remaining 12 oranges, how many oranges did they share

A
60
B
54
C
48
D
42
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Correct Option: B

Let x = the number of oranges

The 1st received 1/3 of x = 1/3x

∴Remainder = x - 1/3x = 2x/3

The 2nd received 2/3 of 2x/3 = 2/3 * 2x/3 = 4x/3

The 3rd received 12 oranges

1/3x + 4x/9 + 12 = x

(3x + 4x + 108)/9 = x

3x + 4x + 108 = 9x

7x + 108 = 9x

9x - 7x = 108

2x = 108

x = 54 oranges

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