Jeff wants to buy a phone car for long distance call. he can buy a 200 minute card for $10.00 or a 300-minute card for $12.00.which card is better value?
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If we say that Jeff is going to use the long distance call for 600m (One of the common multiple of 200m and 300m), 200m card will cost $30.00 (10*3) and 300m card will cost $24.00 (12*2), so it will be better to buy 300minute card.

B-simple yes/no questions