Express the following in the form of ratio
In a school the workload of teaching 19 sections has been assigned to 38 teachers.

Express the following in the form a + ib i^(-19)

Express the following in their simplest form - 19:2

Express the following ratios in their simplest form 2:3

Express the following ratios in their simplest form 5:6

Express the following ratios in their simplest form 19:2

Express the following ratios in their simplest form 8:15

Express the following ratios in their simplest form 20:60

Express the following ratios in their simplest form 16:20

A class teacher has the following attendance record of 40 students of a class of for the whole term . Find the mean number of days a student was present out of 56 days in the term . {:("Number of days","Number of students"),(35-38,1),(38-41,3),(41-44,4),(44-47,4),(47-50,7),(50-53,10),(53-56,11):}

Express the number appearing in the following statements in standard form. The distance of the sun from the centre of the milky way Galaxy is estimated to be 300,000,000,000,000,000,000, m. Express the number appearing in the following statements in standard form.The earth has approximately 1,353,000,000 cubic km of sea water.