Exercise 1A Question 1

The inverse ratio of 11 : 15 is

https://youtu.be/lzRzRvoYobo?t=39

Exercise 1A Question 2

The ratio of two quantities is 3 : 4. If the antecedent is 15, the consequent is

https://youtu.be/lzRzRvoYobo?t=77

Exercise 1A Question 3

The ratio of the quantities is 5 : 7. If the consequent of its inverse ratio is 5, the antecedent is

https://youtu.be/lzRzRvoYobo?t=123

Exercise 1A Question 4

The ratio compounded of 2 : 3, 9 : 4, 5 : 6 and 8 : 10 is

https://youtu.be/lzRzRvoYobo?t=181