Ashifur August 8, 2023 - 17:20
Problem: There are two examination rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, thenthe number of students in A is double the number of students in B. What is the number of students in room A?

View all: PROBASY KALYAN BANK (JO) | WRITTEN QUESTION (MATH) SOLVE | 2014

Correct Answer: ans: The number of students in room A = 100.

Explanation:

Let, the number of students in rooms A and B be x and y respectively.

Then, x-10 = y+ 10

=> x-y= 20 …………….(i)

and x+20=2(y—20)

=> x- 2y = – 6O……………… (ii)

Solving (i) and (ii) we get: x = 100,y = 80.

Write Reply...
You should read | Topics/Questions
A Manufacturing company uses two machines A and B with different production capacities. When working alone, machine A can produce a production lot in 5 hours and machine B can produce the same lot in x hours. When the two machines operate simultaneously to fill the same production lot, it takes them 2 hours to complete the job. How many hours will the machine B take to produce the production lot alone?
Mr. Jones gave 40% of the money he had, to his wife. He also gave 20% of the remaining amount to each of his three sons. Half of the amount now \left was spent on miscellaneous items and the remaining amount of Tk. 12,000 was deposited in the bank. How much money did Mr. Jones have initially?
Abul and Balam ran, at their respective constant rates, a race of 480m. In the first heat, Abul gives Balam a head start of 48m and beats him by$\frac{1}{10}$ th of a minute. In the second heat, Abul gives Balam a head start of 144m and is beaten by $\frac{1}{30}$th of a minute. What is Balam’s speed in m/s?
2 men and 3 boys can do a piece of work in 10 days while 3 men and 2 boys can do the same work in 8 days. In how many days can 2 men and 1 boy do the work?
A labor is paid Tk. 8 per hour for an 8 hour day and $1\frac{1}{2}$ times that rate for each hour in excess of 8 hours in a single day. If the labor received Tk. 80 for a single day’s work, how long did he work on that day?
Solve the equation $\frac{4}{2x+1}+\frac{9}{3x+2}$ = $\frac{25}{5x+4}$
A trader sold a product at a loss of 12.5%. If the selling price was Tk. 37.5 more, hewould have made a profit of 25%. What was the original price of the product?
Janaki spends 20% of her monthly salary for her son‘s education. When she will get her increment of Tk. 170 next month, she plans to spend half of that also for her son’s education. The total money she would spend then would be Tk. 645. What is his present income?
A commodity is produced by using 5 units of labour and 3 units of capital. The total costcomes to Tk. 135. lithe commodity is produced by using 4 units of labour and 2 units of capital, the total cost comes to TK. 98. What is the cost per unit of labour and capital?
If x= $\frac{4}{5}$, then = $\frac{\sqrt{1+x+\sqrt{1-x}}}{\sqrt{1+x-\sqrt{1-x}}}$?  
User Avatar

Articles

0

Comments

0

Rating

0

Login