If the weight of 25 precious stones is 50 grams. How many precious stones of the same type would weigh 4500 kilograms.

10 In a college 7 period a day each of 45 minutes duration. How long each period be, if the school has 9 periods a day assuming the number of hours to be the same? 11 There are 200 students in a primary school. They need 50 litres of drinking eater/day. If 50 of them are reduced how many litres of water needed per day? 13 A mixture of paint is prepared by mixing 1 part of Blue pigments with 5 parts of base. In the following table, find the parts of base that need to be added. 14 In the above question (13) if 1 part of a blue pigment requires 45ml of base, how much blue pigment should we mix with 900ml of base.