A copy machine can print 169 pages in 2 minutes. How many pages can the copy machine print 1 minute

~84.5 pages

Step-by-step explanation:

Why?

Copy machine prints 169 pages per 2 minutes. In order to solve for 1 minute, you must half the total pages printed in 2 minutes to find the value printed in 1 minute (since 1/2 of 2 minutes is 1 minute)

169/2 = ~84.5 pages

Sanity check:

84.5 pages per 1 minute

84.5 x 2 = 169 pages per 2 minutes

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional