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15 Feb 2018, 23:55
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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80% (01:56) correct
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A certain liquid fertilizer contains 10 percent mineral X by volume. If a farmer wishes to treat a crop with 3/4 of a liter of mineral X per acre, how many acres can he treat with 300 liters of the liquid fertilizer?
(A) 40
(B) 24
(C) 18
(D) 16
(E) 12
(A) 40
(B) 24
(C) 18
(D) 16
(E) 12
16 Feb 2018, 00:25
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300 liters of liquid will have (10/100)* 300 = 30 litrers of mineral X
3/4 liters of mineral----------> 1 acre
30 liters of mineral ---------> {1/(3/4)}*30 = 40
--A--
3/4 liters of mineral----------> 1 acre
30 liters of mineral ---------> {1/(3/4)}*30 = 40
--A--
General Discussion
16 Feb 2018, 00:29
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Bunuel
A certain liquid fertilizer contains 10 percent mineral X by volume. If a farmer wishes to treat a crop with 3/4 of a liter of mineral X per acre, how many acres can he treat with 300 liters of the liquid fertilizer?
(A) 40
(B) 24
(C) 18
(D) 16
(E) 12
(A) 40
(B) 24
(C) 18
(D) 16
(E) 12
Instead of trying to generate an expression, we'll let the answers do the work for us.
This is an Alternative approach.
Say (C) were correct. Then each acre wold receive 300/18 = 150/9 = 50/3 = about 17 liters of fertiliezer.
That means it would get 17*10% = 1.7 liters of the mineral.
Too much! We need to more than half the liters of mineral meaning more than double the number of acres
(C) is eliminated as are the smaller (D) and (E).
Let's try (A) as it is more than double (C).
Then each acre receives 300/40 = 30/4 liters of fertilizer and 10% of that is 3/4 liters of mineral.
Yes!
(A) is our answer.
