Question

Find the value of $x$, when $2.5:4=x:7.5$

Answer 1

It is given that
$2.5:4::x:7.5$
We can write it as
$4\times x=2.5\times 7.5$
$x=(2.5\times 7.5)/4$
Now multiplying by $100$
$x=(25\times 75)/(4\times 100)$
By further calculation
$x=75/16=4\frac{11}{16}$