Question

13. A bag contains forty coins, all of them either 2 cent or 5 cent

coins. If the value of the money in the bag is $1.55, find the
number of each kind.

Answer 1

Answer:Let 2 cent coins be a and 5 cent coins be b.

a+b=40

b=40-a

Since the value of money is 1.55,then:

2a+5b=1.55

2a+5b=155

Substituting equation of

2a+5(40-a) =155

2a+200-5a=155

-3a=-45

a=15

b=40-15=25