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
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. :)
