Question 560817
debbie's age is 66, which is 12 less than 6 times donalds's age. how old is donald?

Let
Present age of Donald = d
Given
Debbie's age = 66

Debbie's age = 6d-12
66=6d-12
66+12=6d
78=6d
78/6=6d/6
13=d
d=13

Donald is 13 years old.