Question 1123681
Jessica is x years old
Grandmother is x+54
in one year, x+1 will be Jessica, and 4(x+1)=x+55 for grandmother
4x+4=x+55
3x=51
x=17
Jessica is 17 and her Grandmother is 71
in one year, she will be 18 and her grandmother 72, four times her age.