pizza cost 12$ plus 75 cents for each topping he spends 156$ total ( how much did he spend in total?)

Answer 1

Based solely on the information in the question:

total money/cost of pizza

156/12=13

or 12x12=144, 156-144=12. Based on prior knowledge of 12x12, and noting the difference is 12, we can surmise that 12 pizzas plus our difference of 12(ie 1 additional pizza) equals 13 pizzas.