328 MCGRAW-HILL’S SAT
Concept Review 7: Word Problems
For each of the following statements, specify and name the unknowns and translate the statement into an equation.
- Mike is twice as old as Dave was 5 years ago.
- The population of town A is 40% greater than the population of town B.
- After 2/3 of the marbles are removed from a jar, 5 more than 1/6 of the marbles remain.
- In a jar, there are 4 more than twice as many blue marbles as red marbles.
Solve the following word problems.
- Three candy bars and two lollipops cost $2.20, and four candy bars and two lollipops cost $2.80. What is the
cost of one lollipop? - At a football stadium, 2/3 of the seats were filled at the beginning of a game. At halftime, 1,000 people left
the stadium, leaving 3/7 of the seats filled. What is the total number of seats in the stadium? - If the average of mand nis one-half of the average of sand t,then what is sin terms of m, n,and t?
- A blue chip is worth 2 dollars more than a red chip, and a red chip is worth 2 dollars more than a green chip.
If 5 green chips are worth mdollars, give an expression that represents the price, in dollars, of 10 blue chips
and 5 red chips.