Solve the problem. Round to an appropriate number of significant digits.A theatre sells two types of tickets to their plays; children's tickets and adult tickets. For today's performance they have sold a total of 840 tickets. Also, they have sold 4 times as many children's tickets as adult tickets. How many children's tickets have they sold?
A. 672
B. 49
C. 668
D. 679
Answer: A
Mathematics
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