Question

Andy is one-fourth as old as his grandfather, who is 76 years old. Write an equation to determine whether Andy is 19 or 22 years old.

Answer 1

A=Andy
G=Andy's Grandfather

A*4=G
G=76
A*4=76
/4
a=19

Answer 2

We know that if we multiply Andy's age by four we obtain 76. Lets assume that Andy's age its x. so
4*x=76
Now we have to solve equation
4*x=76 /:4 divide both sides by 4
x=19 - its the answer