If their total age is 4 years and 2 months than that translates into 50 months
If the dog is twice as old as the cat, and the monkey is twice as old as the dog than we should start by figuring out that cats age
7 months is close as
7+(7x2)+((7x2)x2)
Is 49 months. But that's not 50 which means we have a decimal number
7.15 is close
7.15+(7.15x2)+((7.15x2)x2)
As it is 50.05 but that's still not 50 but it's pretty hard to get closer to that without a super longer decimal
(7.15x2)x2 = 28.6 or 29 rounded
If you do want to be more correct than
7.14+(7.14x2)+((7.14x2)x2) is a bit closer at 49.98
(7.14x2)x2 = 28.56 or still 29 rounded
I'd be guessing your teacher would want a rounded number since getting a exact decimal is impossible I think so i'd go with 29 months even though it's not exact. If you aren't sure if you should go with 29 than just add on more numbers to the decimal in a calculator until you come as close as possible but I think its impossible to get exactly 50.
So the monkey's age (Rounded) is 29 months or 2 years and 5 months
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