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Sagot :
Answer:
Step-by-step explanation:
Let x = the 60% pure fruit juice
Let y = the 75% pure fruit juice
Set up two equations. Note that the larger of the two should be the 75% fruit juice because 70% is closer to 75%. The total amount of both % should be 120
60%x + 75%y = 70%120
x + y = 120
60x/100 + 75y/100 = 70/100 * 120
60x + 75y = 70*120
4x + 5y = 70 * 8
4x + 5y = 560
4x + 4y = 120*4
4x + 4y = 480
4x + 5y = 560
4x + 4y = 480 Subtract
y = 80
x + y = 120
x + 80 = 120 Subtract 80 from both sides
x = 120 - 80 Combine
x = 40
Notice that y>x as predicted.
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