Mathematics for IGCSE & O level - Ratio And Proportion (Section 4 - No. 36)
Which scenario(s) represent direct proportion?
The number of hours worked and the total amount of wages earned
The number of items purchased and the total cost
The number of painters and the time taken to complete a wall painting
The distance traveled by a vehicle at constant speed and the time taken.
설명
Direct proportion means both variables increase or decrease by the same factor.