Three waiters, Alex, Bert , and Chris, were supposed to share equally the tips for a week. At the end of a working day, Alex took 1/3 of the tips and left. Bert who did not realize that Alex had taken his share, took 1/3 of the remaining money and left. Finally, Chris came and took 1/3 of the rest of the money and left behind 180 pesos for his friends. What was the total amount of tips in the tip box at the beginning?
-->Solve it backwards. If the sign is division, make it multiplication.
--> since 180 is the 2/3 of the money, then
--> 180 ÷ 2 = 90 , 180 + 90 = 270
--> 270 × 3 = 810
--> 810 × 3 = 2430
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