1. Work can be done by 8 men and 10 women in 25 days, the same work can be done by 10 children and 5 women . in how many days 2 children and 3 men can do?

2. + means * and * means / and / means % what is the value of these question 2+3*5/7 ?

3. (998-1)(998-2)(998-3)…………..(998-n)=——- when n>1000 ?

4. It has 20 mixutre containing milk and water in the ratio 3:5,replace 4 litres of mixture with 4 litres of water what is the final ratio of milk and water.

5. The equivalent compound ratio of 5:6::7:10::6:5