Hi,

*Note: the cheaper brand was added to 650ml of the 50% fruit punch

Let x be the concentration in the punch added

.50*650 + x*100 = .48*750

Simplify and solve

100x = .48*750ml - .50*650ml

100x = 360 -325

100x = 35

x = .35

Concentration in the punch that Jill added was 35%

check your answer

325 + 35 = 360 

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