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31 Mar 2011, 17:06
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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:
35%
(medium)
Question Stats:
81% (02:56) correct
19%
(02:28)
wrong
based on 59
sessions
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If 9a = 16b what is (4a + 6b)/(15a - 16b)
A. 3
B. 4
C. 5
D. 59/63
E. 11
A. 3
B. 4
C. 5
D. 59/63
E. 11
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31 Mar 2011, 18:49
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rxs0005
If 9a = 16b
what is ( 4a + 6b ) / ( 15a - 16b )
3
4
5
59/63
11
what is ( 4a + 6b ) / ( 15a - 16b )
3
4
5
59/63
11
to me the answer seems like to be aprox = 7.4/6 which is bigger then one and less then 3, and not matching any of the answers...can some one explain this
31 Mar 2011, 21:12
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I'm getting 59/48 as answer.
( 4a + 6b )/( 15a - 16b )
= (4a + 6b)/(15a - 9a) (because 9a = 16b)
= (4a + 6b)/6a
= 2/3 + b/a
= 2/3 + 9/16 (because 9a = 16b, so b/a = 9/16)
= (32+27)/48
= 59/48
Could someone please correct me if I'm wrong ?
( 4a + 6b )/( 15a - 16b )
= (4a + 6b)/(15a - 9a) (because 9a = 16b)
= (4a + 6b)/6a
= 2/3 + b/a
= 2/3 + 9/16 (because 9a = 16b, so b/a = 9/16)
= (32+27)/48
= 59/48
Could someone please correct me if I'm wrong ?
