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03 Feb 2017, 08:08
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C
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A boy is buying two kinds of marbles. One kind costs 25 cents per pound and he purchased 5 pounds of this kind. The other kind of marble costs 32 cents per pound. If the boy spent approximately 29 cents per pound for everything, how many pounds of the more expensive marbles did he buy?
A. 5
B. 6
C. 7
D. 8
E. 9
A. 5
B. 6
C. 7
D. 8
E. 9
03 Feb 2017, 23:14
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Suppose the boy bought x pounds of the expensive marbles.
so, we can say:
29(5+x) = 25*5 + x*32
=> 3x = 20
=>x = 6.67 ≈ 7.
Answer C.
so, we can say:
29(5+x) = 25*5 + x*32
=> 3x = 20
=>x = 6.67 ≈ 7.
Answer C.
22 May 2018, 18:08
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Bunuel
A boy is buying two kinds of marbles. One kind costs 25 cents per pound and he purchased 5 pounds of this kind. The other kind of marble costs 32 cents per pound. If the boy spent approximately 29 cents per pound for everything, how many pounds of the more expensive marbles did he buy?
A. 5
B. 6
C. 7
D. 8
E. 9
A. 5
B. 6
C. 7
D. 8
E. 9
We can let n = the number of pounds of the more expensive marbles that he bought and create the equation:
(25 x 5 + 32 x n)/(n + 5) = 29
125 + 32n = 29n + 145
3n = 20
n = 20/3 = 6 2/3 ≈ 7
Answer: C
