Question

Express 3 upon 4 as a rational number with denominator 20

Answer 1

answer is 15 upon 20
i.e. 15/20

Answer 2

Hey Mate
$\frac{3}{4 } \: ca \: be \: as \: \frac{15}{20}$
By Multiplying By 5 on denominator as well as Numerator..
after solving it U will get
$\frac{15}{20} = \frac{3}{4}$