Respuesta :
Answer:
42
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
Answer:
42
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