Direct Variation or Direct Proportion - Math Word Problems - GED, PSAT, SAT, ACT, GRE Preparation - kwizNET Math/Science/English Homeschool/Afterschool/Tutoring Lessons/Worksheets/Quizzes/Trivia

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 weight E of a man on earth's surface is directly proportional to his weight M on mars. The constant of proportionality is 3, if a man weights 126 kg on earth, how much will he weigh on mars? 40 kgs 42 kgs 45 kgs

Q 2: 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 14 and 24 respectively 24 and 14 respectively

Q 3: 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 13 grams 20 grams

Q 4: 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 20 g/sq. cm 16 g/sq. cm 18 g/sq. cm

Q 5: 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? $2,750 $3,500 $3,750

Q 6: The numbers p and q are directly proportional and p=7.5 when q=15. Find p when q=38; and find q when p=13. 26 and 19 respectively 15 and 29 respectively 19 and 26 respectively

Q 7: A motor bike travels 225 km with 5 liters of gas. How many liters of gas are needed to travel 135 km? 3 liters 4 liters 3.5 liters

Q 8: 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 50 m 54 m

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