Question

The employees from maintenance go for coffee together every day

at 9 AM. On Monday, Hector paid $5.45 for three cartons of milk,
four cups of coffee and seven doughnuts. On Tuesday, Guillermo
paid $5.30 for four milks, two coffees, and eight doughnuts. On
Wednesday, Anna paid $5.15 for two milks, five coffees, and six
doughnuts. On Thursday, Alphonse had to pay for five milks, two
coffees, and nine doughnuts. How much change did he get back
from his $10 bill?

Answer 1

To calculate the change from a $10 bill for Alphonse's coffee shop expenses, subtract the total expenses from $10.

Step-by-step explanation:

To find out how much change Alphonse will get back from his $10 bill, we need to calculate the total amount he spent on Monday, Tuesday, Wednesday, and Thursday, and then subtract this total from $10.

On Monday, Hector paid $5.45. On Tuesday, Guillermo paid $5.30. On Wednesday, Anna paid $5.15. And on Thursday, Alphonse paid for $X with his $10 bill. Let's calculate the total by adding up these amounts.

Total amount spent = $5.45 + $5.30 + $5.15 + $X

To find the value of X, we subtract the total amount spent from $10:

$10 - ($5.45 + $5.30 + $5.15) = $X

Now, we can calculate the value of X and find out how much change Alphonse will get back.

Answer 2

A sugestion: calculate m, c, d from:

3m + 4c + 7d = 5.45;
4m + 2c + 8d = 5.30;
2m + 5c + 6d = 5.15;

Then, calculate 10 - (4m + 2c + 9d);