Question

40% of 60% of a number is 1440.find 5% of 20% of 90% of it. ​

Answer 1

Step-by-step explanation:

Let the required number be x.

$\therefore \: 40 \% \: of \: 60 \% \: of \: x = 1440 \\ \therefore \frac{40}{100} \times \frac{60}{100} \times x = 1440 \\ \therefore 0.4 \times 0.6 \times x = 1440 \\ \therefore 0.24 \times x = 1440 \\ \therefore x = \frac{1440}{0.24} \\ \huge \boxed{ \therefore x = 6000} \\ now \: \\ 5 \% \: of \: 20 \% 90 \%\: of \: 6000 \\ = \frac{5}{100} \times \frac{20}{100} \times \frac{90}{100} \times 6000 \\ = 0.05 \times 0.2 \times 0.9 \times 6000 \\ = 0.009 \times 6000 \\ = 9 \times 6 \\ = 54 \\ thus \: \\ \boxed{5 \% \: of \: 20 \% \: 90 \%\: of \: 6000 = 54}$