Proportion Problem

[phoenix9801]

A machine at a golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

A) 3
B) 6
C) 8
D) 10
E) 13

[aneesh.kg]

A machine at a golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

A) 3
B) 6
C) 8
D) 10
E) 13

Rate because of one machine = 16/5 balls per minute
If there are n machines working together, the rate becomes 'n' times of the rate of one such machine.
Combined Rate = 16n/5 balls per minute

Given:
16/5n = 32
n = 10

[spoiler](D)[/spoiler] is correct.

[Anurag@Gurome]

A machine at a golf ball factory can produce 16 golf balls in 5 minutes. If several of these machines work independently and each machine performs at the same rate, how many machines are needed to produce 32 golf balls per minute?

16 balls in 5 minutes ---> 1 machine
16 balls in 1 minute ---> 1*5 = 5 machines
32 balls in 1 minute ---> 5*2 = 10 machines

The correct answer is D.