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40 coins .25 and .10 how many to make $7.75
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3 votes
40 coins .25 and .10 how many to make $7.75

User Oleg Karasik
by
8.3k points

2 Answers

6 votes
7.75
40 coins.
But you have a quarter and a dime. (.35)
so,
3 quarters, subtract .35 = 75-35=40
There's my answer.
User John Breen
by
8.6k points
3 votes
D + Q = 40 so D = 40 - Q
.25Q + .10D = 7.75

substitute D = 40 - Q into .25Q + .10D = 7.75
.25Q + .10D = 7.75
.25Q + .10(40 - Q) = 7.75
.25Q + 4 - .10Q = 7.75
.15Q = 3.75
Q = 25

D = 40 - 25 = 15

answer
Quarter = 25 coins
Dime = 15 coins

double check

25 + 15 = 40 coins total
25(.25) + 15(.10) = 6.25 + 1.5 = 7.75
User Jadero
by
8.3k points
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