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There are 30 students in Mr Magorium's discrete mathematics class: 23 of his students major in mathematics, 12 major in physics, and 3 major in subjects outside of math and physics. How many double major in mathematics and physics?

 May 12, 2020

Best Answer 

 #1
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If you remove the three students who do not major in either math or physics, you will have 30 - 3  =  27 students.

 

If you add the 23 who major in math to the 12 that major in physics, you get 23 + 12  =  35 students.

 

But there are only 27 students, so 35 - 27  =  8  must have a double major in math and physics.

 May 12, 2020
 #1
avatar+21953 
+1
Best Answer

If you remove the three students who do not major in either math or physics, you will have 30 - 3  =  27 students.

 

If you add the 23 who major in math to the 12 that major in physics, you get 23 + 12  =  35 students.

 

But there are only 27 students, so 35 - 27  =  8  must have a double major in math and physics.

geno3141 May 12, 2020

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