Question

A father and his son are respectively 50 years and 20 years old. find the ratio of father's age to his son's age, when
(i) The son was 10 year old ;
(ii) The father was 35 years old;
(iii) The son will be 40 years old;
(iv) The father will be 75 years old. ​

Answer 1

Answer:

1)40:10

2)35:5

3)70:40

4)75:45

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Answer 2

Answer:

see below

Step-by-step explanation:

when the son was 10 years old;

The father was $(50-10=40)$ years old. Therefore the ratio is

$\frac{40}{10} =\frac{4}{1}$

written as 4:1

when the father was 35 years old;

The son was $(20-(50-35))=5$ years old. Therefore, the ratio was $\frac{35}{5} =\frac{7}{1}$

written as 7:1

when the son will be 40 years old;

The father will be $(50+(40-20))=70$ years old. Therefore the ratio will be $\frac{70}{40} =\frac{7}{4}$

written as 7:4

When the father is 75 years old;

The son will be $(20+(75-50))=45$ years old. Therefore, the ratio will be $\frac{75}{45} =\frac{5}{3}$

written as 5:3