Raj's age is 1 year less than twice sarah's age. toni's age is 2 years less than three times sarah's age.

A= 2s -1
B= 3s -2
C= Unknown (maybe try it out with the answers I’ve provided already)

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)