Question 1099557
Let m = the number of ounces of milk
Let j = the number of ounces of juice
The daily intake of sodium will be 15m + 2.5j = 270 [1]
The daily intake of carbohydrates will be 1.5m + 5j = 84 [2]
We have two equations and two unknowns
Multiply [1] by 2 and subtract [2]:
28.5m = 540 - 84 = 456
This gives m = 16
Substitute into [2]:
1.5*16 + 5j = 84
5j = 60
j = 12
So she needs to drink 16 ounces of milk and 12 ounces of juice.