13. 60 chairs and 40 blackboards were purchased for a school. If each chair costs 245 and a blackboard costs
515. Find the total amount of the bill.
14. Take any two odd numbers. Find their product. Is the product an odd number? Repeat the observation for 3
more pairs of odd numbers. What do you conclude?
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the total amount of the bill is =60×245+40×515
=35300
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