The ratio by weight, measured in pounds, of books to clothes to electronics in a suitcase initially stands at 7:5:3. Someone removes 5 pounds of clothing from the suitcase, thereby doubling the ratio of books to clothes. How many pounds do the electronics in the suitcase weigh? Choose one:
A) 3
B) 4
C) 5
D) 6
E) 7
The weights of the items in the suitcase are 7k, 5k, and 3k.   If removing 5 pounds of clothes doubles the ratio of books to clothes, then 5 pounds represents half the weight of the clothes.   2.5k = 5 pounds and then k = 2 pounds.   The electronics weigh 3(2) = 6 pounds.   The answer is 6.
<result>D</result>
The ratio by weight, measured in pounds, of books to clothes to electronics in a suitcase initially stands at 7:5:3. Someone removes 5 pounds of clothing from the suitcase, thereby doubling the ratio of books to clothes. How many pounds do the electronics in the suitcase weigh?