If (10 a³+4b³):(11a³-15b³)=7:5, then (3a+5b):(9a-2b)=?

(49)¹⁵ – 1 is exactly divisible by: 

A wateh dealer pays 10% customs duty on a watch which costs Rs. 500 abroad. He de- sires to make a profit of 20% after giving a discount of 25% to the buyer. The marked price should be

If the price of a commodity is decreased by 20% and its consumption is increased by 20%, what will be the increase or de- crease in the expenditure on the commodity?

Directions: The pie– chart shows the proposed outlay for different sectors during a Five–Year plan of Government of India. Total outlay is Rs. 40,000 crores. By reading the pie–chart answer the following three questions.

What is the ratio between the proposed outlay of Irrigation and Communication?

Diagonal of a given square is 4√2 cm. What is the diagonal of the other square whose area is double of the given square?

Directions: Read the following data carefully and answer the questions given below:

There are 6300 students in Manipur University in the academic year 2020. The ratio of the boys to the girls in the University is 5 : 4. All the students are enrolled in different indoor activities (Chess, Carom, Debating, Painting, and Quiz) and one student is enrolled in only one indoor activity. The number of boys enrolled in the Painting is 621. The ratio of the number of boys who enrolled in Chess to the number of boys who enrolled in Carom is 5 : 3. 36% of the students are enrolled in Quiz. The number of boys enrolled in Debating is 25% of the total number of boys. The number of girls enrolled in Quiz is 640 which is 150 less than the number of girls enrolled in Carom. The number of girls enrolled in Chess is 186 more than the number of boys enrolled in the same activity. The total number of students enrolled in Painting is 816.

The difference in the number of boys and girls who are enrolled in painting is what percentage of the total number of students who are enrolled in Debating? (approximately)

If the speed of a boat in still water is 20 km/hr and the speed of the current is 5km / hr, then the time taken by the boat to travel 100km with the current is