Jason and Hilger are required to paint over the graffiti on a wall. If Jason worked alone, it would take him 20 h to repaint. Working alone, Hilger could do the job in 15 h. How long will it take them to do the painting if they work together? (write your answer as a decimal of hours, do not include units, only use two decimal places)

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

lol.

it's ok we all do this sometimes.

-aparri

p

step-by-step explanation:

answer: need a picture

step-by-step explanation: