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Percentages

by askaichin » Sun Jul 25, 2010 7:48 am
A machine requires 480 ounces of oil everyday, and it is given a mixture of oil A and oil B. Oil A consists of 5% special additives while oil B consists of 8% special additives. If the machine needs exactly 30 ounces of the special additives to ensure smooth operation, then how much of oil A, in ounces, should be in the mixture?

A 260
B 280
C 290
D 300
E 320
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by kvcpk » Sun Jul 25, 2010 8:09 am
askaichin wrote:A machine requires 480 ounces of oil everyday, and it is given a mixture of oil A and oil B. Oil A consists of 5% special additives while oil B consists of 8% special additives. If the machine needs exactly 30 ounces of the special additives to ensure smooth operation, then how much of oil A, in ounces, should be in the mixture?

A 260
B 280
C 290
D 300
E 320
480 = A+B

5A/100 additives in A
8B/100 Additives in B

A/20 + 2B/25 = 30
5A +8B = 3000
5A + 5B = 2400
3B = 600
B = 200
A = 280
pick B
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by rahul goyal » Wed Aug 11, 2010 12:21 am
kvcpk wrote:
askaichin wrote:A machine requires 480 ounces of oil everyday, and it is given a mixture of oil A and oil B. Oil A consists of 5% special additives while oil B consists of 8% special additives. If the machine needs exactly 30 ounces of the special additives to ensure smooth operation, then how much of oil A, in ounces, should be in the mixture?

A 260
B 280
C 290
D 300
E 320
480 = A+B

5A/100 additives in A
8B/100 Additives in B

A/20 + 2B/25 = 30
5A +8B = 3000
5A + 5B = 2400
3B = 600
B = 200
A = 280
pick B
Thanks. But what is OA.
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