Question

75% of a number when subtracted from 20% of 9 times of that number then the result obtained is 3.5 more than the number. Find the number

Answer 1

Answer:

$therefore \: required \: number \: = \: 7$

Step-by-step explanation:

$let \: the \: number \: = x \\ \\ then \: \frac{20}{100} (9x) - \frac{75}{100} \times x = 3.5 + x \\ \\ \frac{9x}{5} - \frac{3x}{4} = 3.5 + x \\ \\ \frac{36x - 15x}{20} = 3.5 + x \\ \\ 21x = 20(x + 3.5) \\ 21x - 20x = 7 \\ x = 7 \\ \\ \\ \\ therefore \: required \: number \: = \: 7$