Question

Solve: $20$ of $14\times 15÷18+10-15$

Answer 1

Using BODMAS rule, we have

$20$ of $14\times 15÷18+10-15$
$=280\times 15÷18+10-15$ [First we will solve 'of' means multiply $20$ and $14$]

$=280\times \left(\frac{15}{18}\right)+10-15$ [Then we will do division, i.e $15÷8$]

$=280\times \left(\frac{5}{6}\right)+10-15$

$=\frac{700}{3}+10-15$ [Then we will do multiplication i.e $280\times \frac{5}{6}=140\times \frac{5}{3}=\frac{700}{3}$]

$=\frac{700+30}{3}-15$ [Then we will add $\frac{700}{3}+10=\frac{700}{3}+\frac{10\times 3}{1\times 3}=\frac{700+30}{3}$]

$=\frac{730}{3}-15$ [At last we will subtract according to Bodmas]

$=\frac{730-45}{3}=\frac{685}{3}$