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Table of ContentsTopic Page #
...3.4B Many or No Solution 333.8A Solving Equations 35
3.8B Solving Formulas 376.5 Absolute Value Equations 393.5/3.6 Ratios and Proportions 41
You always have to write ratios in the simplest form.
You never write the answer as a mixed fraction
Ex 1: Cell phoneA person makes 6 long distance calls and 15 local calls in 1 month.
a. Find the ratio of long distance calls to local calls.
615
= 25
Ex 1: Cell phoneA person makes 6 long distance calls and 15 local calls in 1 month.
b. Find the ratio of local calls to long distance calls
156
= 52
Ex 1: Cell phoneA person makes 6 long distance calls and 15 local calls in 1 month.
c. Find the ratio of long distance calls to all calls.
621
= 27
Ex 2: SportsA volleyball team plays 14 home matches and 10 away matches.
a. Find the ratio of home matches to away matches.
1410
= 75
Ex 2: SportsA volleyball team plays 14 home matches and 10 away matches.
b. Find the ratio of home matches to all matches.
1424
= 712
Ex 2: SportsA volleyball team plays 14 home matches and 10 away matches.
c. Find the ratio of away matches to all matches.
1024
= 512
8
12
24
xx
24(x – 12) = 8x
18 = x
24x – 288 = 8x–288 = –16x
12
24 8
x x
x = 18
3 1
3x – 36 = x2x – 36 = 0
2x = 36
Ex #4: ArchitectAn architect creates a scale model of a school. The school is 50 feet high. The ratio of the model to the actual school is 1 foot to 75 feet. Estimate the height of the model.
model
actual 50
h 1
75
Ex #5:A map has a scale factor of 1cm : 15km. If the distance of the map is 6cm, find the actual distance.
1
15 6
x
x = 90