Question

If 80% of a is 20% of b and b is 5x% of

a. then value of x is ?

Answer 1

$80\%a = 20\%b \\ (8 \div 10)a = (2 \div 10)b \\ 4a = b \: .................................(1) \\ b = 5x\%a \\4a = 5x\%a \\ 4 = (5x \div 100) \\ 5x = 400 \\ x = 90$