Question

An Accounts Receivable clerk has 60 invoices from Customer A, 45 invoices from Customer B, and 15 invoices from Customer C. How many invoices does the Accounts Receivable have in total?

Answer 1

Answer: Answer should 120 invoices

Explanation:

60 + 45 + 15 = 120. I find it sometimes easier to break it down to numbers ending in zero. So I saw the problem as 60 + 40 + 20. Made the math somewhat simpler. Doing that, one could just add 6, 4, and 2 to get 12 and then attach the zero to make it 120.