meganyamazing meganyamazing

30-09-2016
Mathematics

contestada

grandpa's age is 6 years less than 6 times juniors age. their sum of their age is 78.

Respuesta :

bearbedell bearbedell

30-09-2016

6n-6 = Grandpa
n = junior

6n-6+n = 78
+6 +6
7n = 84
/7 /7
n = 12

6(12)-6 = Grandpa
72-6= 66

Junior is 12 years old, Grandpa's age is 66 years old

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michellecoz michellecoz

30-09-2016

Grandpa is 66, Junior is 12.
Grandpa= 6x Juniors age - 6
Grandpa + Junior = 78
78-J = 6J - 6
78 + 6 = 6J + J
84 divided by 7 and 7J divided by 7.
J = 12, so grandpa must be 66.

Answer Link

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