Question

Sasha has 8 coins made up of 5-cent pieces and 10 cent pieces. She has a total of 65 cents. How many are 5-cent pieces

Answer 1

We could write 2 equation based on information above

A = 5-cent coin
B = 10-cent coin
Sum of coin is 8 pcs ==> A + B = 8
Total value of the coin is 65 ==> 5A + 10 B = 65
Solving 2 equation above using substitution

A= 8-B

5(8-B) + 10B = 65

40–5B + 10B = 65

5B = 25 → B= 5

A= 3