Acompany has two types of machines, type r and type s. operating at a constant rate, a machine of type r does a certain job in 36 hours and a machine of type s does the same job in 18 hours. if the company used the same number of each type of machine to do the job in 2 hours, how many machines of type r were used?
a. 3
b. 4
c. 6
d. 9
e. 12

The number of machines to complete job in 2 hours is 6.

Step-by-step explanation:

Using the relation of the rate of each one machine and knowing that adding up both rates.

Rate R =  'x' is the job

Rate S =  'x' is the job

So, using the equation of rates

Rate total is going to be a job in 2 hours so =

adding up

 factoring the x

 simplifying

x=

x= 6

450 is the final answer! : )

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign