Question
A class has 28 students, including 8 girls and the
…… boys. If …… girls leave the class, the probability of randomly selecting a boy becomes 5/6. Which of the following satisfies the two blanks given in the question? I) 20, 4 II) 20, 3 III) 20, 2Solution
Let the number of girls left be x, Total students = 28 The number of girls = 8 Then, the number of boys = 20 -Constable/1731042428-201.JPG)
20 /(28 – x) = 5/6 28 – x = 24 x = 4
A shopkeeper buys 20 articles for Rs 5,000. He sells each article at 25% profit on the cost price. Due to a seasonal sale, he offers a 10% discount on t...
A shopkeeper sold three types of items A, B and C. He sold items A and B in the ratio of 16:21, while sold items C and A in the ratio of  5:8. The pri...
A person buys books at Rs. 300 for 5 and sells them at Rs.740. How many books must he sell in order to earn profit of Rs. 3,520?
The marked price of an article is Rs. 3260. The shopkeeper offered a 15% discount on it and made a profit of 10.84%. What is the percentage by which th...
Three partners ‘A’, ‘B’ and ‘C’ started a business by investing in the ratio 2:5:6 respectively and the ratio of time for which they made th...
Khushi’s earnings decreased by 45% and after that subsequently increased by 45%. Find the final loss % on his earnings.
A purchased an article for Rs 1560. She sold the article at 10% profit. She then added Rs 325 to the amount received and purchased a purse such t...
A dishonest shopkeeper makes a cheating of 25% at the time of buying the goods and 37.5% cheating at the time of selling the goods. He promises to sell ...
A dealer buys three types of mangoes at Rs. 40, Rs. 30 and Rs. 10 kg respectively. He mixes them in the ratio of 2:3:4 by weight and sells them at a pro...
Sara sold 30 scarves at a profit of 25%. If she had sold all the scarves for Rs. 3000 more, her overall profit would have been 50%. What is the selling ...
