Question

1 Are these quantities in direct proportion?
Give reasons for your answers.
a The total cost of bottles of lemonade and the number of bottles bought
b The number of girls in a swimming club and the number of boys in a swimming club
c The total cost of stamps and the number of stamps bought
d The distance travelled in an aeroplane and the time taken to travel that distance
e The number of students in a mathematics class and the students' shoe sizes
f The amount of homework a student does in an evening and the number of
brothers and sisters they have

Answer 1

Answer:

Solution

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(A) As the cost of water bottles increases with increase in number of bottles, thus there is a direct proportion between the number of bottles and their cost.

(B) If a vehicle in moving with a uniform speed, then the distance cover is directly proportional to the time taken by the vehicle.

(C) The fare charge increases with increase in distance, thus there is a direct proportion between the distance travelled and fare charge for it.

(D) If the number of persons increases then food will last for less number of days and vice versa, thus there is an inverse proportion between the number of person and the number of days for which the food should last.

Step-by-step explanation:

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