Question
Solution
Total number of students = 15 + 13 + 10 + 14 + 12 + 6 ⇒ Total number of students = 70 Students in class interval 160-170 = 10 + 14 = 24 Percentage of students in class interval 160-170 = (24/Total students) × 100 ⇒ Percentage of students in class interval 160-170 = (24/70) × 100 = 34.28 ∴ The percentage of students whose height is in the class interval of 160-170 is 34% (correct to the nearest integer)
Twenty five liters of 60% concentration of acid solution is added to 35 liters of 80% concentration of acid solution. What is the concentration of acid ...
- The cost of fencing a rectangular field at the rate of Rs. 13/metre is Rs. 1560. The ratio of the length to the breadth is 7:5. Find the area of the field.
A square’s side is 25% less than the length of a rectangle. The area and breadth of the rectangle are 2000 cm² and 40 cm respectively. Calculate the ...
Find the time taken by a pipe, which releases 400 m3 of water in a minute to fill an empty cylindrical tank of radius 20 m and height 14 m. [...
A cube has edge 13 m. Find its length of diagonal, surface area and volume.Â
The radius of a cylinder is equal to the radius of a circle whose circumference is 88 units. If the height of the cylinder is 50% more than its radius, ...
A rectangular plot of size 40 m (length) Â 20 m (width) is to be grazed by a horse leaving a margin of 5 m from all sides for growing plants and also it...
A room 20 m long, 16 m broad and 8m high has 2 windows of 1 m and `1(1)/(2)` m and a door of 2m `xx` `1(1)/(2)` m. Find the cost of paperi...
The total surface area of a right circular cone is twice the surface area of a sphere having the same radius. If the volume of the sphere is 2304π cm...
The circumference of a circle is 66 cm and the length of the rectangle is 4 times the radius of the circle. Find the area (in cm2) of the rec...
Relevant for Exams:
