Question

17. Two fifth of one-third of three - seventh of a numberis 15. What will be 40% of the number.
(1) 72
(2) 84
(3) 136
(4) None of these​

Answer 1

Answer:

84 is the answer! not sure

Answer 2

$let \: the \: number \: be \: x \\ then \: 2 \div 5 \times 1 \div 3 \times 3 \div 7 \times x = 15 \\ 2x \div 35 = 15 \\ x = 15 \times 35 \div 2 \\ 40\% \: of \: x = 40 \div 100 \times 15 \times 35 \div 2 = 105$

so the right answer is none of these...