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McGraw Hill Integrated II, 2012 View details

7. Scale Drawings and Models

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Exercise 29 Page 605

Create and solve a proportion.

C

Practice makes perfect

We are given that Lydia can type 80 words in two minutes, and we are asked to determine how many minutes it will take Lydia to type 600 words. To evaluate this time, we will create a proportion. Let x be the number of minutes we are looking for. 80/2=600/x Now, we will solve the above proportion using cross multiplication.

80/2=600/x

CrossMult

Cross multiply

80* x=2*600

Multiply

80x=1200

DivEqn

.LHS /80.=.RHS /80.

x=1200/80

CalcQuot

Calculate quotient

x=15