Question

In 10 years from now, the combined age of 3 friends will be 100. What was the combined age
of the three, 10 years ago?
60
40
70
80
plsssss give answer only if you know give fast​ plzz

Answer 1

Answer:

x+y+z = 100

x-10 + y-10 + z-10

x+y+z= 30

therefore there combined age was 70.. ten years ago

Answer 2

Answer:

Combined age of friends = x

Combined age of friends 10 years from now = x+3(10) = x+30

(∵there are three friends 30 will be added)

x+30 = 100

x = 70

Combined ages of friends 10 years ago = x-30 = 40