Question

$14$ tins contain $210$ liters of oil. How much oil is contained in $17$ tins ?

Answer 1

By unitary method, we have:
Cost of $14$ tins $=210$liters
Cost of $1$tins $=\left(\frac{210}{14}\right)=15$liters $\left[Lesstins,lessliters\right]$

Cost of $17$tins$=17\times 15=255$liters $\left[Moretins,moreliters\right]$

Hence, the oil is contained in $17$ tins is $255$liters.