Question

The ages of John and David are in the ratio 5 : 7. Four years later the sum of their ages will be 56 years. What are their present ages ?​

Answer 1

The age of John is 5 × X that is 5×4= 20

The age of David is 7 × X that is 7×4= 28

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Here is your answer

\rule{120}{2}

Let the age of John be 5x and age of David be 7x

After 4 years, their ages will be 5x + 4 and 7x + 4

The sum of their ages = 56

According to the question,

5x + 4 + 7x + 4 = 56

12x + 8 = 56

12x = 56 - 8

12x = 48

x = \frac{48}{12}

12

48

x = 4

∴ Age of John = 5x = 5 * 4 = 20 years

∴ Age of David = 7x = 7 * 4 = 28 years