Jony is 20 years older than Rony. In 10 years, Rony's age will be half that of Jony's. What is Rony's age?

A 3 years
B 10 years
C 20 years
D 25 years

Correct Answer: 10 years

Let, Rony age = R, Jony age = J এখানে বর্তমানে, R = J - 20 বা, J = R + 20 10 বছর পর, R + 10 = (J + 10)/2 বা, 2R + 20 = J + 10 বা, 2R + 20 = R + 20 + 10 so, R = 10
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একজন চাকরিজীবীর আয় ও ব্যয়ের অনুপার ২০ঃ ১৫ হলে, তার মাসিক সঞ্চয় আয়ের শতকরা কত অংশ?
A ৩০%
B ১৫%
C ২০%
D ২৫%
একটি ট্রান্সফরমারের প্রাইমারি ও সেকেন্ডারি তারের ঘূর্ণনের অনুপাত 20ঃ 1 এবং সেকেন্ডারিতে 20 omega রোধ লাগানো আছে। যদি প্রাইমারিতে 220 V প্রয়োগ করা হয় তাহলে এর মধ্যে বিদ্যুৎ প্রবাহ হবে-
A 0.55 A
B 27.5 mA
C 27.5 A
D 5.5 mA

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