Question

a jar contains 50 coins, all either 2 cents or 5 cents. the total value of coins is $1.87. how many 2 cents coins are there?

Answer 1

Answer:

no. of 2 cent coins are 21

Step-by-step explanation:

let no. of 2 cent coins be x

Therefore, 5 cent coins are 50-x

2x + 5(50-x)=187

2x + 250-5x=187

-3x=-63

x=21

Answer 2

Answer:

21

Step-by-step explanation:

as there are 100 cents in a dollar so

100 × 18.7= 187

x + y = 50. 1

2x +5y = 187. 2

-2(x+y) = -2(50)

2x + 5y = 187

-2x and 2x cancel out

then add other terms

3y = 87

y =87/3

y =29

by 1

x + 29 =50

x=50-29

x=21