King's birthday

To celebrate the king's birthday, workers fire 1/5 all purchased rockets. To celebrate the Queen's birthday, fire 1/6 of the remaining rockets, and to celebrate the birthday of the king's son, the remaining 15,000 rockets. How many rockets did they purchase?

Correct answer:

x =  22500

Step-by-step explanation:


x-x/5-1/6·(x-x/5)=15000

20x = 450000


x = 450000/20 = 22500

x = 22500

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