Question : I have x marbles, my elder brother has 3 more than me, while my younger brother has 3 less than me. If the total number of marbles is 15, the number of marbles that I have is:
Option 1: 3
Option 2: 5
Option 3: 8
Option 4: 7
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Correct Answer: 5
Solution :
Suppose, I have x marbles.
My elder brother has (x + 3) marbles,
My younger brother has (x – 3) marbles.
According to the question,
⇒ x + (x + 3) + (x – 3) = 15
⇒ 3x + 3 – 3 = 15
⇒ 3x = 15
⇒ x = 5
Hence, the correct answer is 5.
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