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11. A mom gives her small child either dimes or quarters for helping with odd jobs around the house. At the
end of the day, the child has 9 coins with a total value of $1.20. How many were dimes and how many were
quarters?

Respuesta :

zacks55

Step-by-step explanation:

2 q and 7 dimes kkkkkkkkk

clarch19

Answer:

q = 2

d = 7

Step-by-step explanation:

System of Equations:

d + q = 9

10d + 25q = 120

Use Substitution:

let d = 9 - q

10(9 - q) + 25q = 120

90 - 10q + 25q = 120

15q = 30

q = 2

d = 7

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