The ticket seller sold 1,280 scratch cards in three days. On the second day, he sold 90 tickets less than on the first day, on the third day he sold 1.5 times more tickets than on the second day. How many tickets did he sell on the third day?

Correct answer:

c =  510

Step-by-step explanation:

a+b+c=1280 b=a90 c=1.5b  a+b+c=1280 b=a90 c=1.5 b  a+b+c=1280 ab=90 1.5bc=0  a=430 b=340 c=510

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