After 16 years

After 16 years will Dana be five times older as she was four years ago. After how many years will Dana celebrate her 16th birthday?

Correct result:

x =  7

Solution:

r+16 =5(r-4)
x = 16-r

r+16 =5•(r-4)
x = 16-r

4r = 36
r+x = 16

r = 9
x = 7

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