Location: UK Test Date: 30/9/2008 Target GMAT Score: 720
Posted: Wed Jul 09, 2008 4:50 am Post subject:
Hi codesnooker,
The answer is D.
(1) creates 2 equations with 2 variables, so you can resolve the problem
x + y =77
x = y + 1
(2) states that both x & y share the same tens digit.
The only tens digit the can share is 3 (2 would sum less than 40 and 4 would add up more than 80).
Then you have to separate the number 17 in two one digit numbers (to add them to x and y) and this number can only be separated as 8 + 9.
Thus you have two solutions x=38 & y = 39 or x=39 & y = 38.
But since the question asks the value of x*y you don't really care which one is 39 and which is 38.
I hope to have been clear (I'm still improving my English)
Test Date: Not Decided Target GMAT Score: 800 GMAT Score: 580
Posted: Wed Jul 09, 2008 5:58 am Post subject:
It's a height of my carelessness. I had done wrong division while dividing 77 with 2. That's weird 100% weird.
Thanks Augusto for opening my eyes. _________________ Code Snooker
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Decisions are neither wrong nor right, only their results are either good or bad.
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That's weird 100% weird.