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McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

7. Spherical Geometry

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Exercise 34 Page 862

Note that 3:5=3x:5x for any nonzero value of x.

B

Practice makes perfect

The ratio of males to females in a classroom is 3:5. Since 3:5=3x:5x for any nonzero value of x, let us assume that number of males in the classroom is 3x and the number of females is 5x. We know that the total number of students is 32. This tells us that 3x+ 5x= 32. Let's find x!

3x+ 5x= 32

▼

Solve for x

Add terms

8x=32

.LHS /8.=.RHS /8.

x=4

We are asked to find the number of females. Since x=4, the number of females is 5x=5(4)=20. This corresponds to option B.

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Exercises p.859-862