১২১০১
The difference between the length and the breadth of a blackboard is 8cm. If the breadth is decreased by 4cm and the length increased by 7cm, the area remains the same. Find the dimensions of the blackboard?
উত্তর
28, 20
১২১০২
100kg of solution A is mixed with 60kg of solution B. If solution A has tin and copper in the ratio 1 : 4 and solution B has lead and tin in the ratio 3 : 2, then what is the amount of tin in the new solution?
উত্তর
44kg
১২১০৩
Read the following questions carefully and choose the right answer. In an office, 44% of the workers prefer coffee and 72% prefer tea. If each of them prefers coffee or tea and 40 like both, the total number of workers in the office is
উত্তর
250
১২১০৪
The difference between the radii of bigger circle and smaller circle is 14cm and the difference between their areas is 1,056cm2. Radius of the smaller circle is
উত্তর
5cm
১২১০৫
A jar contains a mixture of oil and water in the ratio 22: 3. 50 liters of the mixture was taken out and 25 liters of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in liters) in the jar?
উত্তর
125
১২১০৬
The ratio of the length to the breadth of a rectangular park is 3 : 2, if a man cycling along the boundary of the park at the speed of 12 km/hr completes one round in 8 minutes, then what is the area of the park?
উত্তর
1,53,600 m²
১২১০৭
A boat takes 19 hours to travel downstream from point A to point B and coming back to a point C midway between A and B. If the speed of the stream is 4 km/hr and the speed of the boat in still water is 14 km/her, what is the distance between A and B?
উত্তর
180 km
১২১০৮
Given that 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is
উত্তর
9 : 10
১২১০৯
On reducing the entry fee by 35% in a park, the number of people coming to the park increased by 40%, then the percent increase or decrease in the income from the entry fee is
উত্তর
9% decrease
১২১১০
Three numbers are added in pairs, the sums so obtained are 20, 27 and 23. What are those three numbers?
উত্তর
8, 12 and 15