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There are two examination rooms A and B. If 10 students are sent from A to B, the number of students in each room becomes the same. If 20 candidates are sent from B to A, the number of students in A becomes double the number of students in B. What is the number of students in room A?

A. 100

B. 120

C. 130

D. 150

E. none of these

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সঠিক উত্তরঃ A. 100

Explanation:

there are two examination rooms A and B. If 10 students are sent from A to B , the number of students in each room because the same. If 20 candidates are sent from B to A, the number of students in A becomes double the number of students in B. What is the number of students in room A?
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At a photocopy center , the first 10 copies cost .x taka each. Each of the next 50 copies costs 2 taka less per copy. From the 61st copy , the cost is 1taka per copy . In terms of. x how much does it cost in taka to have 200 copies made?
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Fahim bought 48 headphones and found that 8 of the headphones were not working for which his per unit cost increased by TK.24.What was the cost of each headphone?
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There are two examination rooms A and B. If 10 students are sent from A to B, the number of students in each room becomes the same. If 20 candidates are sent from B to A, the number of students in A becomes double the number of students in B. What is the number of students in room A?