Question

Marina bought 4 books. Joey bought half as many books as Ben bought. Together, the three friends fought 13 books. How many books did Ben buy?

a. 9 books
b. 6 books
c. 3 books
d. 2 books​

Answer 1

the answer is b. 6

step by step:

M = 4. B let x = the number of books for ben. therefore. J = 1/2x. The sum ... 1.5x = 9. divide by 1.5 on both sides. x = 6 (Ben bought 6). 1/2x = 3 (Jose bought 3).