Q11 Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.

Q12 What is the least number, which when divided by 7, 8 and 11 always gives 6 as the remainder?

Q13 5 farmers have 7,9,11,13 & 14 apple trees ,respectively in their orchards .So far each of them discovered that every tree in their orchard bore same number of apples .Further if the third farmer gives one apple to the first ,and fifth gives three to each of the second and the fourth , they would all have exactly the same number of apples .What were the yields per tree in the orchards of the third and fourth farmers ?