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Let the number of mango trees and the lichi trees in the orchard be 5x and 8x respectively. According to the question, Number of apple trees in the orchard = 5x + 0.4 × 5x = 7x Therefore, 5x + 8x + 7x = 85 Or, 20x = 85 Or, x = 4.25 Number of lichi trees in the orchard = 4.25x = 34
A bag contains 13 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the nu...
From a well-shuffled deck of 52 cards, two cards are drawn one after the other without replacement. What is the probability that the first card is a red...
Two hats are picked at random, what is the probability that all hats are of green colour?
A bag contains black and white balls, such that the probability of picking a black ball is 4/7. If the probability of picking two black balls without re...
A bag contains 9 black and 10 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
...The probability of selecting a rotten apple randomly from a heap of 1050 apples is 0.36. What is the number of rotten apples in the heap?
An instructor has a question bank consisting of 200 easy True / False questions, 300 difficult True / False questions, 400 easy multiple-choice question...
Out of three girls and five boys, five children are to be randomly selected for a dance programme. What is the probability that all the selected childre...