If x : y = 3 : 1, what is the value of “x^{2} – y^{2} : x^{2} + y^{2}”?
In a college, the ratio of the number of boys to the number of girls is 5 : 3. If 80 boys leave the college and 40 girls join the college, the number of the girls will become the same as the number of boys. What is the initial number of boys in the college?
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The ratio of two numbers is 5 : 8 and their difference is 117. What is the smaller number among the two?
If the square of the sum of two numbers is equal to 4 times their product, what is the ratio of these numbers?
In 450 litres mixture of acid and water, the ratio of acid and water is 7 : 5. What amount of water should be added to the mixture so that the ratio of acid to water becomes 3 : 5?
If m : n = 5 : 2, what is the value of (2m + 5n) : (3m – 5n)?
A class has two sections, the average marks of all the students in the class is 80. The average marks of all the students of Section A is 75 and the average marks of all the students of Section B is 90. What is the ratio of the number of students in Section A to that in section B?
A and B together have Rs. 19,350. If 5/9 of A’s amount is equal to 2/5 of B’s amount. What amount does A have?
The sum of two numbers is equal to four times their difference. What is the ratio of the bigger number to the smaller number?
A school has 900 students out of which 60% are boys. What is the ratio of 75% of total girls to 80% of total boys?
If a : b : c = 4 : 5 : 2 and 2a – b + 3c = 54, what is the value of b?
In a regiment, the ratio of the number of gazetted officers to that of nongazetted officers was 1 : 10. 10 gazetted officers joined the regiment and 10 nongazetted officers left the regiment, so the ratio of the number of gazetted officers to that of nongazetted officers became 1 : 8. What was the initial number of gazetted officers?
Two numbers are in the ratio 5 : 7. On subtracting 20 from each, the new ratio becomes 7 : 10. What is the difference between the original numbers?
The students in three classes are in the ratio 2 : 3 : 5 respectively. If 80 students are increased in each class, the ratio becomes 3 : 4 : 6. What was the initial number of students in all three classes together?
314 videos170 docs185 tests

314 videos170 docs185 tests
