Question

A total of $324$ coins of $20$ paise and $25$ paise make a sum of `$71.$ The number of $25$ paise coins is ........... .

• A. $120$
• B. $124$
• C. $144$
• D. $200$

Answer 1

The correct option is B $124$

$\to$ Here, let the no. of 20 paise coins be x.

Than, no. of 25 paise coins $=324-x$

$\therefore 0.20\times x+0.25(324-x)=71$

$\therefore 20x+25(324-x)=7100$

$\therefore 5x=1000$

$\therefore x=200$

$\therefore$ The no. of 20 paise coins is $200RS$

The no. of $25$ paise coins $=324-200=124$ coins