Missing digits

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mattocks: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Sun Mar 07, 2010 1:17 pm

by mattocks » Sun Jul 18, 2010 8:29 am

7x
xy
xx
__

117

The above represents addition with x and y representing certain digits. What is the value of y?

A. 1
B. 2
C. 3
D. 4
E. 5

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Source: Beat The GMAT — Problem Solving | Sun Jul 18, 2010 8:29 am

aloneontheedge: Senior | Next Rank: 100 Posts; Posts: 97; Joined: Thu Jan 28, 2010 2:07 am; Thanked: 9 times

by aloneontheedge » Sun Jul 18, 2010 8:39 am

mattocks wrote:7x
xy
xx
__

117

The above represents addition with x and y representing certain digits. What is the value of y?

A. 1
B. 2
C. 3
D. 4
E. 5

Y = 3
Approach 2x +y = 7 plug values from the choices and check
start with x = 1,y =5
x= 2 y =3 This satisfies.

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singhpreet1: Senior | Next Rank: 100 Posts; Posts: 95; Joined: Tue Jun 08, 2010 11:27 am; Thanked: 7 times

by singhpreet1 » Sun Jul 18, 2010 8:40 am

mattocks wrote:7x
xy
xx
__

117

The above represents addition with x and y representing certain digits. What is the value of y?

A. 1
B. 2
C. 3
D. 4
E. 5

lets assume x is 2, therefore 7x= 72, lets assume y is 3, xy=23, then xx=22,

therefore, 72+23+22=117.

i did by trial and error method.

what is the OA?

Preet

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