Greg and Bill

Greg is 18 years old. He is 6 less than 4 times Bill's age. How old is Bill?

Result

b =  6

Solution:

g=18 g=4b−6  b=(g+6)/4=(18+6)/4=6g=18 \ \\ g=4b - 6 \ \\ \ \\ b=(g+6)/4=(18+6)/4=6

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