Multiple choice

By weight, in a mixture of 5 grams, liquid A makes up 7 percent of solution I and 14.5 percent of solution II. If 3 grams of solution I is mixed with 2 grams of solution II, then liquid A accounts for what percent of the weight of the resultant solution?

  1. 6.09%

  2. 10%

  3. 10.75%

  4. 21.5%

  5. 50%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the mixture of 5 grams, A makes up 7% of 3 grams and 14.5% of 2 grams, or  (21/100 + 29/100) grams or 50/100 grams, or 1/2 gram. So, its percentage in the mixture of 5 grams is (1/2)/5 × 100 =  1/10 × 100 = 10%

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