16 men can complete a piece of work in 8 days. 20 women take 16 days to complete the same piece of work. 12 men and 10 women work together for 6 days. How many more days would 10 women alone require to complete the remaining piece of work?

From the first two statements it is obvious that the capacity of 1 man = the capacity of 2.5 women And the total work can be finished by 320 women in one day.

Now 12 men + 10 women = 12 $\times$ 2.5 + 10 = 40 women Hence, during 6 days the work done is equal to the work of 240 women in one day. Hence, the remaining work will be finished in (320 - 240) $\div$ 10 = 8 days

The number of frogs in a pond increase by 10% at the end of every year. If at the start of the year 2004, there were 2,14,000 frogs in the pond, then what would be the number of frogs in the pond by the end of the year 2006?

On Children's Day sweets were to be equally distributed amongst 540 children. But on that particular day, 120 children were absent. Thus, each child got 4 sweets extra. How many sweets was each child originally supposed to get?

A boat covers a distance of 24 km in 10 hrs downstream. To cover the same distance upstream, the boat takes two hours longer. What is the speed of the boat in still waters?

Sonia started a business by investing Rs 60,000. Six months later Vivek joined her by investing Rs 1,40,000. After one year Kirti joined them by investing Rs 1,20,000 At the end of two years from the commencement of the business, they earn a profit of Rs 4,50,000. What is Vivek's share in the profit?

What approximate value should come in place of question mark (?) in the following questions? (You are not expected to calculate the exact value.) (421% of 738) $\div$ 517 = ?