Problem of the day 7/15/11

 16 identical books weigh 90.88 kg. How much will 9 such books weigh?

	45 kg
	51.12 kg
	48.2 kg
	54.52 kg      Answer: 51.12 kg.  Explanation: 90.88 kg/ 16= 5.68   9 times 5.18= 51.12 kg