Question

if 3/7 of 64%of x/21 is 1280 then the value of x

Answer 1

$\frac{3}{7} \times \frac{64}{100} \times \frac{x}{21} = 1280 \\ \\ \frac{1}{7} \times \frac{64}{100} \times \frac{x}{7} = 1280 \\ \\ x = 1280 \times \frac{7 \times 7 \times 100}{64} \\ \\ x = \frac{6272000}{64} = 98000$

The required number is = 98,000 .

Answer 2

Given :
3/7 of 64%of x/21 is 1280

To Find :
Value of x

Solution :
$\frac{3}{7} \times \frac{64}{100} \times \frac{x}{21} = 1280 \\ \\ \frac{1}{7} \times \frac{64}{100} \times \frac{x}{7} = 1280 \\ \\ x = 1280 \times \frac{7 \times 7 \times 100}{64} \\ x = \frac{6272000}{64} = 98000$

Thank You!