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# If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?

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Math Expert
Joined: 02 Sep 2009
Posts: 53020
If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?  [#permalink]

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22 Jan 2019, 00:56
00:00

Difficulty:

35% (medium)

Question Stats:

71% (00:53) correct 29% (01:16) wrong based on 25 sessions

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If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?

A 10
B 20
C 40
D 60
E 80

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Joined: 31 Oct 2013
Posts: 1138
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?  [#permalink]

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22 Jan 2019, 01:01
Bunuel wrote:
If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?

A 10
B 20
C 40
D 60
E 80

6b + 10c = 20

2(3b + 5c) = 20

3b + 5c = 10

Given ,

a + 3b + 5c = 30

a + 10 = 30

a = 20

4a = 20*4

4a = 80.

E is the correct answer.
Re: If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?   [#permalink] 22 Jan 2019, 01:01
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# If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?

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