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John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
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14 Oct 2019, 02:55
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least bills 12*10+1*5+3*1 ; 128$ i.e 12+1+3 ; 16 bills IMO B
John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
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14 Oct 2019, 03:19
For the least possible number of notes, John has to use 12 out of his 13 $10 bills, 1no. $5 bill, and 3no. $1 bill. Hence total = 12+1+3 = 16 i.e. 12*10 + 1*5 + 3*1 = 120+5+3 = $128
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14 Oct 2019, 03:37
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John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
A. 14 B. 16 C. 17 D. 19 E. 20
To reach near to the amount of $128, ten-dollar bills must be maximum in number such that it satisfies the condition. So, 10 * 13 + 5 * .. does not satisfy as it is more than 128 10 * 12 + 5 * 1 + 1 * 3 = 128 Total 16 bills 10 * 11 + 5 * 3 + 1 * 3 = 128 Total 17 bills [Since 10 = 5 * 2, total number of bills is gong to increase here on-wards because for every decrease in number of ten dollar bills there's an increase of two five dollar bills] 10 * 10 + 5 * 5 + 1 * 3 = 128 Total 18 bills (similar trend as above)
Answer B.
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14 Oct 2019, 03:57
Quote:
John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
A. 14 B. 16 C. 17 D. 19 E. 20
(12*10$)+(1*5$)+(3*1$)=128$ Thus, least number of bills= 12+1+1=16
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14 Oct 2019, 04:41
Quote:
John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
Re: John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar
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14 Oct 2019, 07:03
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John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?
Available bills, $ 10 bills = 13, $ 5 bills = 11 and $ 1 bills = 17