 <translate> If one medium pizza costs $18 and with the promotion I can buy one for $5, then I'm saving $18 - $5 = $13 on each medium pizza. If I take full advantage of the promotion, that means I bought all 3 medium pizzas, therefore I saved a total of 3 * $13 = $39 in total. So the final answer is 39. <yor> Bí píìsà kan bá jẹ́ $18 tí mo sì lè ra ọ̀kan fún $5, nígbà náà, màá fi $18 - $5 = $13 pamọ́ lórí píìsà kọ̀ọ̀kan. Bí mo bá lo àǹfààní ìkésíni náà, ìyẹn túmọ̀ sí pé mo ti ra gbogbo pizzà mẹ́ta náà, nítorí náà, mo ti fi 3 * $13 = $39 pa mọ́. Nítorí náà ìdáhùn tó gbẹ̀yìn ni 39. 