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Two-fifths of one -fourth of three -seventh of a number is 15. What is half of that number?

Correct Answer: None of these

Explanation:

Let us assume the number is P.
According the question,
three -seventh of a number = 3/7 x P
one -fourth of three -seventh of a number = 1/4 x 3/7 x P
Two-fifths of one -fourth of three -seventh of a number = 2/5 x 1/4 x 3/7 x P
⇒ 2/5 x 1/4 x 3/7 x P = 15
⇒ 2 x 1 x 3 x P = 15 x 7 x 4 x 5
P = 15 x 7 x 4 x 5 / 2 x 3
P = 5 x 7 x 2 x 5
P = 350
P /2 = 350/2
P /2 = 175


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