Question
A girl appeared in 5 exams, each having a maximum of 200
marks. Her scores in the exams were 180, 150, 165, 190, and 175. She randomly tells her marks of one subject to her friend. What is the probability that the marks she shares are of the exam in which she scored more than 80%?Solution
ATQ,
80% of 200 = 0.8 × 200 = 160
The number of exams where she scored more than 160 marks = 4
So, the required probability = (4/5) = 0.8
The wheel of an engine 5 (1/9) meters in circumference makes five revolutions in 4 seconds. Find the speed of the train in km per hour.
A retailer sells 12 metres of cloth and earns a profit equal to the cost price of 3 metres of cloth. Find the profit percentage.
A book is sold at two different prices. When sold at a loss of 22%, it fetches Rs. 165 less than when it is sold at a profit of 11%. What would be the s...
A dealer sold two of his cattle for Rs. 500 each. On one of them he lost 10% on the other, he gained 10%. His gain or loss percent in the entire transa...
A shopkeeper planned to sell 150 shirts each priced at Rs 1,250 in a particular year. Each shirt, if it had been sold at the mentioned price would have ...
Guru and Chirag are dealers of mobile. The price of mobile is Rs. 54,000. Guru gives a discount of 20% on whole, while Chirag gives a discount 22% on t...
The selling price of an article by two different vendors is Rs.860 and profit earned is 25%. One vendor counts his profit on cost price while other one ...
A Washing Machine was sold with two successive discounts of 12% and 20%. If it had been sold with a single discount of 32%, there would have been a lo...
A shopkeeper bought two articles for Rs. 250 each. If he sold one of them at 40% profit and the other at 20% loss, then find the difference between the ...
- An article was purchased for Rs. (20n + 400). It was labeled 30% higher than its cost and sold after applying a discount of Rs. (2n + 50). If the seller ma...
