book Maths Puzzle Numerical Ability

The height of an equilateral triangle is 18 meters. What is its area?

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Thanks for your help sir.

The present age of A and B is in the ratio of 9:7. After 10 years, it would be in the ratio of 7:5. Find their present ages I need help with a question, Find the value of a in the equation

5
--- =
a+3

3
---
a-2

I think the answer is a= 2 3/8

Am I right, Can someone let me know?