3 years ago

Joanne and Betty have a combined age of 60 years. If Joanne is 18 years old, how old is Betty?

Mathematics

2 answers:

denis23 [38]3 years ago

8 0

Answer:

Step-by-step explanation:

kirill115 [55]3 years ago

3 0

Answer:

Step-by-step explanation:

Let Joanne age be x

let betty age by y

. ° . x + y = 60

if joanne is 18

y = 18

x + 18 = 60

x = 60 - 18

x = 42

. ° . betty = 42

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