<p>At North West school, the ski team had 15 members and the debate team had 12 members. If a total of 11 students belong to one of the two groups, how many students belong to both groups?</p>
<p>Assuming that a total of 11 students belonged to ONLY one of the two groups</p>
<p>Let n = number of students who are in both groups
(15 - n) + (12 - n) = 11
n = 8</p>
<p>Hope that helped noob :).</p>
<p>Thank you sir! :)</p>
<p>Here is another question!</p>
<p>If the angles of a triangle measure x,y, and z and these angles are in ratio 3:4:5 respectively,what is the value of Z?</p>
<p>Easiest way is to write all three in terms of some other variable, preserving the ratio:
x=3a, y=4a, z=5a.</p>
<p>Angles of a triangle must add to 180, so:
3a+4a+5a=180
12a=180
a=15</p>
<p>z=5a
z=75</p>
<p>Thank you! That’s a better way of thinking. 
Cheers!</p>
<p>but wouldn’t the method above ust be finding the angle z, not the side Z? Are you sure the answer is not 5 for Z (since sides opposite angles’ correspond, if this is a 3,4,5 angle wouldent the side opposite z (Z) be equal to 5)?</p>
<p>it asks for the angles</p>
<p>The correct answer is 75.</p>
<p>Information about angles can be used to determine side proportions but not actual side lengths.</p>