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1. At present Lili is 23 years old and Medrin is 15 years old. How many years ago was Lili twice as old as Mehrin?
- A. 7
- B. 7
- C. 7
- D. 7
Answer: Option A
Explanation:
Hints: ধরি, x বছর পূর্বে লিলির বয়স মিলির বয়সের দ্বিগুন ছিলো ।
( 23 - x) = 2 ( 15 - x)
23 - x = 30 - 2x
2x - x = 30 - 23
x = 7
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