Question

1. Solve :

1) The ages of Sonu and Monu are in the ratio 7: 5. Ten years later, the ratio of their ages ԝill be 9: 7. Find their present age.​

Answer 1

Answer:

the age of Sonu be x and monu be y

x-7=y-5

10(x-7)=10(y-5)

10x-70=10y-50

x=7,y=5

Step-by-step explanation:

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Answer 2

Answer:

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Step-by-step explanation:

Let the present age of Sonu be 7x years

Present age of Monu be 5x years

Hence,

• Sonu’s age after 10 years = (7x + 10) years
• Monu’s age after 10 years = (5x + 10) years

So, (7x + 10) / (5x + 10) = 9 / 7

by using cross-multiplication we get,

7(7x + 10) = 9(5x + 10)

49x + 70 = 45x + 90

49x – 45x = 90 – 70

4x = 20

x = 20/4 = 5

Hence,

• Present age of Sonu is 7x = 7(5) = 35years.
• Present age of Sonu is 7x = 7(5) = 35years. Present age of Monu is 5x = 5(5) = 25years