Question

Heena has only rs.2 and.rs.5 coins.if in all she has 80 coins.in her purse.amounting to rs.232 ,find the number of rs.5 coin?

Answer 1

Answer:

24

Step-by-step explanation:

let x be the no. of rs 2 coins and y be the no. of rs 5 coins.

thus, x+y=80. ..,..(1). ( bexause ahe has total 80 coins)

also the amount of all rs 2 coins and allrs 5 coins will be 2x and 5y respectively

thus,total amount =2x+5y

thus,2x+5y=232.......(2)

multiplying eqn(1)by 2 and then aubtraxting eqn (2) from eqn(1),we get

2x+2y=160

-2x-5y=-232

_____________

-3y=--72

y=24

no.of rs 5 coins are 24