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1. The difference between two numbers is 5 and the difference between their square is 65. What is the smaller number?
- A. 4
- B. 4
- C. 4
- D. 4
Answer: Option A
Explanation:
ধরি, সংখ্যা দুটি x ও y যেখানে x > y
x - y = 5
x2 - y2 = 65
( x + y) ( x - y) = 65
( x + y) 5 = 65
x + y = 65/5
x + y = 13
বড় সংখ্যাটি = ( x + y) + ( x - y) / 2 = 13 + 5/2 = 9.
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