Question

$5$ pens and $b$ook together cost Rs. $225$. Cost of $10$ pens is equal to the cost of $1$ book. Find the total cost of $3$ pens and $2$ books.

Answer 1

$5$ pens $+1$ Book $=225$

$10$ pens $=1$Book

$5$ pens $+10$ pens $=225$

$15$ pens$=225$

$1$ pen $=15$

$1$ Book $=10\times 15$

$1$ Book $=150$

Cost of $3$ pens $+2$ Books

$=3\times 15+2\times 150$

$=30+300$

$3$ pens $+2$ Books $=330$.