5 7th grade math questions::EXAMPLE - What fraction of the pins are in the back row in bowling?

Question

1. How many computers are in the room if all but two are made by Apple, all but two are made by IBM, and all but two are made by Commodore?

2. J.S. Bach had the top-selling classical album in 1983, and Michael Jackson had the top-selling pop album. Bach was born long before 1958, the year of Jackson's birth. When was Bach bord? The number of years separating the dates of birth is a three digit number. Each digit is a prime number; the tens' digit the largest, the hundreds' digit the smalles. The sum of the digits is 12 and the product of the digits is 42.

3. Plastic credit cards were first issued in the U.S. 10 years before Kennedy took office as President. In what year were plastic credit cards first issued? The sum of the digits of the year is 16 and the product of the digits is 45.

4. What fraction of the pins are in the back row in bowling?

5. In gymnastics te rings are suspended from a bar that is 17 feet 11 inches from the floor. Ropes hold the ringes 9 feet 9 inches below the bar. How far are the tops of the rings from the floor?

Answer 1

#1 is 3. 1 made by Apple, 1 by IBM, and 1 by Commodore. Think about it.
#2 is 273. 2 is the smallest and 7 is the biggest. They are all prime #'s. 2+7+3=12 2*7*3=42
#3 is 1951. 1+9+5+1=16 1*9*5*1=45
#4 is 2/5. 10 pins 4 in the back row. 4/10=2/5
#5 is 8 feet 2 inches. 17'11"-9'9"=8'2"