Source: Official Guide Revised GRE 1st Ed. Part 6; Set 1; #9

1

If y=3x and z=2y, what is x+y+z in

If y=3x and z=2y, what is x+y+z in terms of x? 10x, 9x, 8x, 6x, 5x

2 Explanations

1

Roshan Shrestha

Here,
x+y+z=x+3x+2y [as z=2y]
=4x+2(3x) [as y=3x]
=4x+6x
=10x
Which gives us an answer choice [A]

Jan 19, 2017 • Comment

Sam Kinsman, Magoosh Tutor

Yes, that's right! Good job :)

Jan 19, 2017 • Reply

2

Gravatar Chris Lele, Magoosh Tutor

Oct 7, 2012 • Comment

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