এনএসআই NSI এর সহকারী পরিচালক

51. If a² - b² = 20, a+b = 5, what is the value of a - b ?

• ক. 3
• খ. 15
• গ. 5
• ঘ. 4

52. A restaurant makes 0% profit after selling a set menu at a discount of 20%. What is the percentage increase of marked price?

• ক. 30%
• খ. 20%
• গ. 40%
• ঘ. 50%

53. Ahmed sold a t-shirt for Tk. 810, and gain 8%. How many did he purchase it for?

• ক. Tk. 750
• খ. Tk. 875
• গ. Tk. 745
• ঘ. Tk. 756

54. Two trucks 300 km away are travelling towards each other with a constant speed. Truck A is moving at a constant speed of 70 km/h while truck B is moving at a constant speed of 50 km/h. How long does it take for them to meet?

• ক. 5 hours
• খ. 3 hours
• গ. 2.5 hours
• ঘ. 6 hours

55. If 12 men work on a particular task, it takes them 4 days to complete it. On the other hand, 12 women can complete the same task in 12 days. How many days would it take if the 12 men and 12 women cooperated with each other to finish the same task?

• ক. 5 days
• খ. 6 days
• গ. 8 days
• ঘ. 16 days

56. It takes 5 hours to fill a container using machine A. The same container can be filled using machine B in 10 hours. When the container is full, Machine C can fully empty the container in 20 hours. If all three machines start working on the same empty cont

• ক. 1/2 hours
• খ. 4 hours
• গ. 2 hours
• ঘ. 15 hours