Name _______________________________________ Date __________________ Class __________________
LESSON
1-8
Problem Solving
Solving Equations by Adding or Subtracting
Write the correct answer.
1. The 1954 elevation of Mt. Everest
was 29,028 ft. In 1999, that elevation
was revised to be 29,035 ft. Write an
equation to find the change c in
elevation of Mt. Everest.
2. The difference between the boiling
and melting points of fluorine is 32°C.
If the boiling point of fluorine is
188°C, write an equation and solve
to find the melting point m of fluorine.
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4. A city in Alaska has an average
January temperature of 13°F. The
April average is 43°F higher than the
January average. Write an equation
to find the average April temperature.
3. Lisa sold her old bike for $140 less
than she paid for it. She sold the
bike for $85. Write and solve an
equation to find how much Lisa
paid for her bike.
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Choose the letter for the best answer.
5. A survey found that female teens
watched 3 hours of TV per week less
than male teens. The female teens
reported watching an average of 18
hours of TV. Find the number of
hours h the male teens watched.
A h6
C h  18
B h  15
D h  21
6. It costs about $125 more per year to
feed a hamster than it does to feed a
bird. If it costs $256 per year to feed a
hamster, find the cost c to feed a bird.
C p  249,377
B p  350,655
D p  152,099
H c  $256
G c  $125
J c  $381
8. In 1940, the life expectancy for a
female was 65 years. In 1999, the life
expectancy for a female was
79 years. Find the increase in the life
expectancy for females.
7. From 1990 to 2000, the population of
a city in Florida increased by 99,278.
If the 2000 population was 251,377,
find the population p in 1990.
A p  253,377
F c  $131
F 14 yrs
H 14 yrs
G 1.2 yrs
J 144 yrs
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Holt McDougal Mathematics