Question

If 6 container lorries can transport 135 tonnes of goods in 5 days, how many more lorries are required to transport 180 tonnes of goods in 4 days?

Answer 1

Let the number of lorries required more $=x$.
As the goods are more $=$ More lorries are needed to transport.
$\therefore$ It is direct proportion.
$\therefore$ Multiplying factor $=\frac{180}{135}$
Again if more days $\Rightarrow$ less number of lorries enough.
$\therefore$ It is direct proportion.
$\therefore$ Multiplying factor $=\frac{5}{4}$
$\therefore 6+x=6\times \frac{180}{135}\times \frac{5}{4}$
$6\times \frac{180}{135}\times \frac{5}{4}$
$6+x=10$
$x=10-6$
$x=4$
$\therefore 4$ more lorries are required.