Answer: Number of hours they all will take is
Step-by-step explanation:
Since we have given that
Number of hours Walter and Bill takes to do the job = 4 hours
Number of hours Tom alone takes to do the job = 3 hours
We need to find the number of hours takes them together to decorate the room.
Work done by Walter and Bill =
Work done by Tome =
total work done by three is given by
Hence, Number of hours they all will take is
The equation for it is: y = -3x + 5
I hope this helps you
11) 39+93+?'=180 ?'= 48
?+70= 48+62
?=110-70 ?=40
13) 50+55=?+80
?= 25
15) 30+60+?'=180 ?'=90
20+?=60+?'
20+?=60+90
?= 130