Question

two fift of one third of three seventh of a numberis 15; what is the 40%of that number

Answer 1

$\text{Let the number = x}$

$\text{According to the question}$

$\frac{2}{5} ( \frac{1}{3} ( \frac{3}{7} (x))) = 15 \\ \\ \frac{2}{5} \times \frac{1}{3} \times \frac{3}{7} \times x = 15$

$\frac{2}{35} \times x = 15 \\ \\x = 15 \times \frac{35}{2}$

$x = \frac{525}{2}$

$\text{The number is } \frac{525}{2} \\ \\ 40 \: percent \: of \: \frac{525}{2} = \frac{525}{2} \times \frac{40}{100} = \boxed{ 105 }$

40% of the number is 105.

Answer 2

Let the number = xNow, according to question : 25 of 13 of 37 of x = 15⇒25 × 13 × 37 × x = 15⇒2x35 = 15⇒2x = 15 × 35⇒2x = 525⇒x = 5252Now, 40% of x = 40% of 5252 = 40100×5252 = 20×525100 = 105