Question
After increase in the price of coffee by 20 %, a person
is able to buy 4 kg less for Rs. 1,440. Find the original and increased price of the coffee per kg.Solution
Let the original price (O.P.) be Rs. x per kg. ∴ New price (N.P.) = 120% of x = Rs. 6x/5 per kg. Quantity of coffee the person could buy at original price = 1440/x kg. Quantity of coffee he can buy at new price = (1440 × 5)/6x = 1200/x kg Given that difference between the quantity at original price and at new price is 3 kg. ∴ 1440/x - 1200/x = 4 ⇒ 240/x = 4 ⇒ = 60 ∴ O.P. = Rs.60 and N.P. = Rs. 6x/5 = (6 × 60)/5 = Rs.72
Each side of square ‘A’ is 6 cm less than that of square ‘B’. The perimeter of a rectangle is 4 times the difference of the perimeters of the tw...
Measure of each interior angle of a regular polygon can never be?
Area of a rectangle is equal to the total surface area of a hemisphere having volume 5488 cm³ . Find the perimeter of the rectangle if its length is 12...
- If the edge of the cube is increased by 100%, then find the percentage increase in the volume of the cube.
The length and breadth of a rectangle are increased by 30% and 40% respectively. The increase in the area of the resulting rectangle will be:
- The ratio of the length to breadth of a rectangular playground is 7:5. If the cost of fencing the playground at the rate of Rs. 4 per metre is Rs. 1920, th...
Three circles of radius 6 cm are kept touching each other. The string is tightly tied around these three circles. What is the length of the string?
The two parallel sides of a trapezium are 27 cm and 13 cm respectively. If the height of the trapezium is 8 cm, then what is its area in m²?
Ratio of length to width of a rectangular field is 3:5. If the perimeter of the field is 160 metres, then find the area (in m2) of the field.
The height of a triangle is equal to the perimeter of a square whose diagonal is 6√2 m and the base of the same triangle is equal to the side of a...
Relevant for Exams:
