SOLUTION: A jar contains 50 coins all either 2 cents or 5 cents. The total value of the coins is $1.87. How many 2 cents coins are there?

Question 936396: A jar contains 50 coins all either 2 cents or 5 cents. The total value of the coins is $1.87. How many 2 cents coins are there?
Answer by srinivas.g(540) (Show Source): You can put this solution on YOUR website!
let x be the no of 2 cents coins and y be the no of 5 cents coins
total no of coins =50
x+y= 50 -------------eq(1)
The total value of the coins is $1.87
x*0.02+y*0.05 = 1.87 .........eq(2)

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving 1*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=29. Since , x=21.

Answer: .

no of 2 cents coins =21
no of 5 cents coins =29
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