How many grams of 65% and 50% acid is to be mixed to give 240 g acid with a concentration of 60%?

Correct answer:

a =  160
b =  80

Step-by-step explanation:

a+b= 240
0.65a+0.50b = 0.60•240

a+b= 240
0.65•a+0.50•b = 0.60•240

a+b = 240
0.65a+0.5b = 144

a = 160
b = 80

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