L Mohan Lal Solutions for Exercise 1: PREVIOUS QUESTIONS

Students of a class collected money for a polio campaign. Each boy donated $\mathrm{Rs}.50$ and each girl donated $\mathrm{Rs}.60$. If the class strength is $50$ and the total amount collected is $\mathrm{Rs}.2800$. Find the number of girls in the class?

A purse contains one rupee, five rupees, ten rupee and twenty rupee notes in the ratio of $1:2:5:7$. Their total value is $Rs. 201$. Find the number of ten-rupee notes?

If $a:b=3:4$ and $b:c=8:9$ then $a:c$?

If, $0.6\times A=0.09\times B$, then $A:B=$?

If $7 : x\hspace{0.17em}:: 17.5 : 22.5$, then $x=$ ?

In a row one trees is $5th$ one on either two sides. How many trees are there in that row?

If $a:b=2:5$ and $b:c=6:7$, find $a:b:c$ ?

If $A=\frac{1}{2}B$ and $B=\frac{1}{5}C$, then $A:B:C=$ ?