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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Math Word Problems - GED, PSAT, SAT, ACT, GRE Preparation
7.9 Direct Variation or Direct Proportion


Directions: Answer the following questions. Also write at least ten examples of your own.
Q 1: The expenditure per month for 15 students in a dormitory is $2,250. If 10 more students joined, what will be the monthly expenditure now?
$3,750
$2,750
$3,500

Q 2: The pressure P exerted at any point on the base of a tank filled with liquid varies directly as the depth D of the liquid. The pressure exerted by the liquid 25 cms deep on the base of the tank is 10 g/sq. cm. What will be the pressure when the depth is
16 g/sq. cm
18 g/sq. cm
20 g/sq. cm

Q 3: The numbers x and y are directly proportional and x=9 when y=3. Find x when y=8; and find y when x=42.
25 and 15 respectively
24 and 14 respectively
14 and 24 respectively

Q 4: A motor bike travels 225 km with 5 liters of gas. How many liters of gas are needed to travel 135 km?
3.5 liters
4 liters
3 liters

Q 5: The amount of heat (H) produced in human body by burning of proteins is directly proportional to the amount of proteins (A) burnt. If burning of 1 gram of proteins produces 32 calories of heat, how much proteins should be burnt to produce 52 calories?
15 grams
20 grams
13 grams

Q 6: A family spends 120 dollars per month for vegetables when the cost of vegetables is 5 dollars per kg. How much amount must the family spend per month, if the cost of vegetables goes up to 5.75 dollars per kg?
138 dollars
140 dollars
130 dollars

Q 7: One evening the length of the shadow of a building's pillar of height 28 m is 42 m. What will be the length of the shadow of the building's tower of height 36 m at that time?
45 m
54 m
50 m

Q 8: The numbers r and s vary directly and the constant of variation is 3/5. Find r if s=45; and find s if r =33.
55 and 27 respectively
27 and 55 respectively
50 and 25 respectively

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Question 10: This question is available to subscribers only!


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