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Let, number of book and number of pen sold by shopkeeper be 23x and 15x respectively. Number of pencil sold by shopkeeper = 8/3 × 15x = 40x So, 23x × 40 + 15x × 20 + 40x × 10 = 22680 ⇒ 920x + 300x + 400x = 22680 ⇒ 1620x = 22680 x = 14 Number of pen sold by shopkeeper = 15x = 210
The average of 27 numbers is 20.The average of first 13 numbers is 15 and that of the last 13 numbers is 18. What will be the 27th number?
A frustum of a cone has radii of 5 cm and 3 cm, and a height of 8 cm. What is its volume?
Out of 4 numbers, the average of first 3 is 19 and last 3 is 20. If the last number is 21. Find the first number?
Each side of a rhombus is 20cm long and the length of one of its diagonals is 24cm, then find the area of the rhombus.
The average age of 32 children and their teacher's age are 28 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?