Question

If $8$ kg of rice costs ₹$420$,What will be the cost of $18$kg of rice?

Answer 1

By unitary method, we have:
Cost of $8kg$ rice $=420$₹
Cost of $1kg$rice $=\left(\frac{420}{8}\right)=52.5$₹ $\left[Lesskgrice,less\cos t\right]$

Cost of $18kg$rice$=18\times 52.5=945$₹ $\left[Morekgrice,more\cos t\right]$

Hence, the cost of $18kg$ rice is ₹$945$.