Question

if 20% of 50 is greater than 15% of a number by 4,find the number​

Answer 1

20% of 50=10 and 15% of x is 15x/100. Then according to question 15x/100=10-4 then 15x =600. This implies x=600/15. So x=40. Required answer

Answer 2

Let the number be x


According to the given condition

20% of 50 - 15% of x = 4

☛ $\dfrac{20}{100}$ × 50 - $\dfrac{15}{100}$ × x = 4

☛ $\dfrac{1}{5}$ × 50 - $\dfrac{3}{20}$ × x = 4

☛ 10 - $\dfrac{3x}{20}$ = 4

☛ $\dfrac{200 - 3x}{20}$ = 4

☛ 200 - 3x = 4 × 20

☛ 200 - 3x = 80

☛ 200 - 80 = 3x

☛ 3x = 120

∴ x = 40


∴ The number is $\underline{\underline{\textsf{40}}}$