Question

17. Two-fifth of one-third of three-seventh of a number is 15. What is 40 percent
of that number?
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Answer 1

As given

Two-fifth of one -third of three-seventh of number is 15.

Let us assume that the unknown number be x .

Simplify the above

x = 262.5

Percentage formula

Percentage = 40%

Total value = 262.5

Put all the values in the formula

Part value = 105.

Therefore the  40 percent of the 1575 is 105 .