Ratio and Proportion:
1. The speeds of 3 cars are in the ratio 3:5:9. The ratio between the time taken by them to travel the same distance is:
1. The speeds of 3 cars are in the ratio 3:5:9. The ratio between the time taken by them to travel the same distance is:
Solution:
Speed = Distance/ Time
The Time ratio is 1/3: 1/5: 1/9
The required ratio is 15: 9: 5
2. In a college, the ratio of the girls and boys is 4:7. If there are 420 boys, the total number of students in the college is:
Solution:
The Number of boys = 420.
7x = 420
x = 60.
The total number of students = 4x+7x
= 11x =11(60)
= 660.
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