Printers and Computers

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msch14: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Wed Mar 04, 2009 12:12 pm

by msch14 » Thu Jun 18, 2009 4:06 pm

M orders 50 computers and printers. N orders 60 computers and printers. How many computers did M order?

A. M & N ordered the same number of computers
B. N ordered 10 more printers then M

The OA is E . How would you go about setting up this problem?

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Source: Beat The GMAT — Data Sufficiency | Thu Jun 18, 2009 4:06 pm

kc_raj: Master | Next Rank: 500 Posts; Posts: 117; Joined: Wed May 13, 2009 7:41 am; Thanked: 5 times

IMO

by kc_raj » Thu Jun 18, 2009 4:11 pm

Mc+Mp=50
Nc+Np=60,

A Mc=Nc, still 3 variables, 2 equns

B Np=Mp+10, 4 var, 3 eqns

combining we get back B, not any new eqn, so E

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