S K Gupta and Anubhuti Gangal Solutions for Exercise 5: Exercise

Which is a better buy - a dozen bananas for $₹30$ or a score of bananas for $₹40$?

Which car has a better speed - the one covering $240 \mathrm{km}$ in $5$ hours or the one covering $180 \mathrm{km}$ in $4$ hours?

Three rolls of cello-tape cost $₹48$. At the same rate, the cost of $12$ rolls of cello-tape is

$15$ iron balls of same size weigh $10 \mathrm{kg} 50 \mathrm{g}$.How many of them will weigh $4 \mathrm{kg} 690 \mathrm{g}$?

Weight of $72$ books is $9 \mathrm{kg}$. What is the weight of $80$ such books?

Weight of $72$ books is $9 \mathrm{kg}$. How many such books weigh $6 \mathrm{kg}$?

$15$ postcards cost $₹11.25$. What will be the cost of $36$ postcards?

$15$ postcards cost $₹11.25$. How many postcards can we buy for $₹225$?