Question

Mary’s number is eleven more than Jerry’s. The sum of their numbers is 89. What are their numbers?

Answer 1

Take 89 minus 11 to find twice of Jerry's number . To find Jerry's number divide the answer by two which is 89-11 =78. 78 divide by 2 is 39 . To find Mary's number add 39 and 11 .
Hence Mary has 50
Jerry has 39

Answer 2

Let x be represent the number of Jerry and x + 11 for Mary.
x = Jerry
x + 11 = Mary
Getting Jerry's number:
x + (x + 11) = 89
2x + 11 = 89
2x = 89 - 11
2x = 78
2x/2 = 78/2
x = 39
Getting Mary's number(simplify):
x + 11
= 39 + 11
= 50
.
Therefore, Mary and Jerry's age are 50 and 39, respectively.
:)