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Math Expert V
Joined: 02 Sep 2009
Posts: 64080
If 8x + 5 = 21, then 3x + 4 =  [#permalink]

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Difficulty:   5% (low)

Question Stats: 100% (00:21) correct 0% (00:00) wrong based on 36 sessions

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If 8x + 5 = 21, then 3x + 4 =

A. 2
B. 5
C. 10
D. 16
E. 17

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Manager  G
Joined: 19 Apr 2017
Posts: 103
Concentration: General Management, Sustainability
Schools: ESSEC '22
GPA: 3.9
WE: Operations (Hospitality and Tourism)
Re: If 8x + 5 = 21, then 3x + 4 =  [#permalink]

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If 8x + 5 = 21, then 3x + 4 =

8x + 5 = 21
=> 8x=21-5
=> 8x=16
=> x=2

3x + 4 =3(2)+4=10 =C Re: If 8x + 5 = 21, then 3x + 4 =   [#permalink] 09 Aug 2019, 08:47

# If 8x + 5 = 21, then 3x + 4 =  