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7/10 must be added to 3/10 to make 1 whole.
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10
NOT: 15 ounces to make 10%Correct answer:Twenty ouncesCalculus:Let it be M ounces. Then:20%*(M ounce) + 5%*(40 ounce) = 10%*(M+40 ounce)20*M + 200 = 10*M + 400(20-10)*M = 400-20010M = 200M = 20
To make a 10% sugar solution you need to dissolve 10 grams of sugar and bring the volume up to 100 ml