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OG 12 #229 -> 600-700 or 700-800 level question ?

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by Lifetron » Fri Mar 22, 2013 1:52 am
Right triangle PQR is to be constructed in the xy-plane
so that the right angle is at P and PR is parallel to the
x-axis. The x- and y-coordinates of P, Q, and R are to
be integers that satisfy the inequalities -4 ≤ x ≤ 5 and
6 ≤ y ≤ 16. How many different triangles with these
properties could be constructed?

(A) 110
(B) 1,100
(C) 9,900
(D) 10,000
(E) 12,100

OA C

I 've read/heard that 700-800 level question won't be tough, concept wise but will be calculation intensive. Is that correct ?

What should one expect at the test ? How will 700-800 level math questions normally be ?

Thank you !
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by Anju@Gurome » Fri Mar 22, 2013 2:11 am
gughanbose wrote:Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities -4 ≤ x ≤ 5 and 6 ≤ y ≤ 16. How many different triangles with these
properties could be constructed?
x and y are integer and -4 ≤ x ≤ 5 and 6 ≤ y ≤ 16.
Therefore possible number of values of x is 10 and that of y is 11.

Now PR is parallel to x-axis --> y coordinates of P and R must be same
As PQR is a right-angled triangle with right angle at P and PR parallel to x-axis, PQ must be parallel to y-axis. Which again infers x coordinates of P and Q must be same.

Thus we can freely choose the coordinates of P and according to that we have to select the coordinates of Q and R.

For P, (x, y) can be selected in --> x in 10 ways and y in 11 ways --> 10*11 ways
For Q, (x, y) can be selected in --> x is fixed and y in 10 ways (1 already selected for P) --> 10 ways
For R, (x, y) can be selected in --> x in 9 ways (1 already selected for P) and y is fixed --> 9 ways

Thus different coordinates of PQR can be simultaneously selected in 9*10*10*11 = 9900 ways. Each of these will result in a different right-angled triangle.

The correct answer is C.
Anju Agarwal
Quant Expert, Gurome

Backup Methods : General guide on plugging, estimation etc.
Wavy Curve Method : Solving complex inequalities in a matter of seconds.

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by Brent@GMATPrepNow » Fri Mar 22, 2013 5:22 am
gughanbose wrote:
I've read/heard that 700-800 level question won't be tough, concept wise but will be calculation intensive. Is that correct ?
With most GMAT math problems, there's a quick solution and a long solution. 700+ level questions will be more complex, so their long solutions will likely require lots of calculations. The true difficulty with 700+ level questions is spotting the fast solution.

If you're interested, here's another 700+ level question involving counting triangles in the coordinate plane: https://www.beatthegmat.com/how-many-tri ... tml#118134

Cheers,
Brent
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by Brent@GMATPrepNow » Fri Mar 22, 2013 5:25 am
gughanbose wrote:Right triangle PQR is to be constructed in the xy-plane
so that the right angle is at P and PR is parallel to the
x-axis. The x- and y-coordinates of P, Q, and R are to
be integers that satisfy the inequalities -4 ≤ x ≤ 5 and
6 ≤ y ≤ 16. How many different triangles with these
properties could be constructed?

(A) 110
(B) 1,100
(C) 9,900
(D) 10,000
(E) 12,100

OA C
My solution can be found here: https://www.beatthegmat.com/og-13-coordi ... 57190.html

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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