If 20 women can lay a road of length 100m in 10 days. 10 women can lay the same road of length 50m in: 

The diameters of two cones are equal. If their slant heights are in the ratio 5: 2, then the ratio of curved surface areas of the cones is _________ .

In a year, the average expenditure of a family for the first 3 months, next 4 months and last 5 months is Rs 8400 per month, Rs 10080 per month, Rs 10608. Monthly and annual savings are Rs. 8640. If so, what is the average monthly income of this family?

Solve it $$ {sin \ θ\over 1+cos\ θ}+{1+cosθ\over sin\ θ}=?$$

The length and the breadth of a rectangle are made to increase and decrease, respectively, by 8% and 10%. What is the percentage increase or decrease in its area?

P can complete a piece of work in thrice the time taken to complete Q and R together. If P and Q together can complete the work in 9 3/5 days and R alone complete in 16 days, then find the no of days taken to complete the work by P alone?

The ratio of the sum of two numbers and their difference is 5:1. The ratio of the greater number to the smaller number is-

If x% of $${25\over 2}\%$$ is 150, then the value of x is :