The ratio of copper and zinc in a brass alloy is 13 : 7. How much zinc will be there in 100 kg of the alloy?

In the binary system, what is the decimal value of 1011?

A bag contains ₹1, 50p, and 25p coins in the ratio 5 : 6 : 8. If the total value is ₹420, find the number of 50p coins.

A sum of ₹1200 amounts to ₹1320 in 2 years at simple interest. What is the rate of interest per annum?

What is the decimal equivalent of the binary number 1010?

If the ratio of the areas of two circles is 4 : 9, then the ratio of their circumferences is:

A mixture of 40 litres of milk and water contains milk and water in the ratio 3 : 1. How much water must be added to this mixture so that the ratio of milk and water becomes 2 : 1?

A sum of ₹2,500 becomes ₹2,975 in 3 years at simple interest. What is the rate of interest?

If 10 men can complete a work in 12 days, how many men are required to complete the same work in 8 days?

The ratio of land to water for the whole earth is 1 : 2 and in the Northern Hemisphere, it is 2 : 3. What is the ratio of land to water in the Southern Hemisphere?

The prices of two cycles are in the ratio 16 : 23. If the price of the first cycle is increased by 10% and that of the second by ₹477, the ratio becomes 11 : 20. Find the original price of the second cycle.

The ratio of the ages of X and Y is 3 : 1. After 15 years, the ratio will be 2 : 1. Find the present age of X.

In a partnership, A and B start a business by investing ₹20,000 and ₹25,000 respectively. After 4 months, C joins them with ₹15,000. Find the ratio of their profits at the end of the year.

The ratio of the ages of A and B is 4 : 5. If the sum of their ages is 81 years, find the age of B after 5 years.

The ratio of the ages of X and Y is 7 : 3. After 4 years, the ratio becomes 2 : 1. What is the present age of X?

The ratio of land to water for the whole earth is 1 : 2. In the Northern Hemisphere, it is 2 : 3. What is the ratio in the Southern Hemisphere?

What is the binary representation of the decimal number 5?

A sum of ₹5,000 becomes ₹6,050 in 2 years at compound interest. What is the annual rate of interest?

If (a + b) : (a - b) = 15 : 1, then what is the ratio (a² + b²) : (a² - b²)?

The ratio of copper and zinc in an alloy is 5 : 4. If 1.25 kg of zinc is added to 11.25 kg of this alloy, find the new ratio of copper to zinc.