Question

Ryan gave seven of his model cars to a friend then he bought six more cars now Ryan has 13 cars how many did Ryan start with

Answer 1

Gave away 7 ⇒ -7

Bought 6 ⇒ + 6

Left with 13

If he did not buy the 6 cars ... 
13 - 6 = 7
If he did not give the 7 cars away ...
7 + 7 = 14

He has 14 cars at first.


13 - 6