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If 12x - 4 = 20, then 4x - 1 =
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20 Feb 2018, 02:13
20 Feb 2018, 02:13
1
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Question Stats:
97% (00:29) correct
2% (00:39) wrong based on 48 sessions
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Re: If 12x - 4 = 20, then 4x - 1 =
[#permalink]
20 Feb 2018, 15:00
20 Feb 2018, 15:00
amorphous wrote:
If 12x - 4 = 20, then 4x - 1 =
A)1
B)2
C)5
D)7
E)24
A)1
B)2
C)5
D)7
E)24
APPROACH #1: Solve for x first
Given: 12x - 4 = 20
Add 4 to both sides to get: 12x = 24
Solve to get: x = 2
So, 4x - 1 = 4(2) - 1
= 8 - 1
= 7
Answer: D
APPROACH #2: Make the given equation resemble the expression 4x - 1
Given: 12x - 4 = 20
Add 4 to both sides to get: 12x = 24
Divide both sides by 3 to get: 4x = 8
Subtract 1 from both sides to get: 4x - 1 = 8 - 1
Simplify: 4x - 1 = 7
Answer: D
Cheers,
Brent
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GMAT 1: 700 Q51 V31
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WE:Engineering (Computer Software)
Re: If 12x - 4 = 20, then 4x - 1 =
[#permalink]
19 Sep 2022, 09:36
19 Sep 2022, 09:36
Given that 12x - 4 = 20 and we need to find the value of 4x - 1
12x - 4 = 20
=> 3*4x = 20 + 4 = 24
=> 4x = \(\frac{24}{3}\) = 8
=> 4x - 1 = 8 - 1 = 7
So, Answer will be D
Hope it helps!
12x - 4 = 20
=> 3*4x = 20 + 4 = 24
=> 4x = \(\frac{24}{3}\) = 8
=> 4x - 1 = 8 - 1 = 7
So, Answer will be D
Hope it helps!
