The yield of wheat from 6 hectares is 280 quintals. Find the number of hectares required for a yield of 225 quintals.

The mean distance of Mars from the sun in 1.524 times that of the Earth from the sun. Find the number of years requires for Mars make one revolution about the Sun.

Find the number of rectangles excluding squares from a rectangle of size 9 × 6.

3 men and 4 boys can complete a certain amount of work in 28 days, whereas 4 men and 6 boys can complete the same work in 20 days. Find : The number of days required by 7 men and 6 boys to complete the same work.

From an algebraic expression to give the number of line segments required to make the following pattern and hence find the number of line segments required for 10 houses.

Find the number of subsets that can be formed from the set A={4,5,6}

Let A={2,3} and B={4,5,6}. Find the number of relations from A to B.

(3)/(5) quital of wheat cost Rs. 210. find the cost of : 0.4 quintal of wheat.

A farmer harvests his crop and expresses his harvest in three different ways. (a) I have harvested 10 quintals of wheat. (b) I have harvested 10 quintals of wheat today in one acre of land. (c) I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing. Do the above statements mean one and the same thing. If your answer is ‘yes', give reasons. And if your answer is ’no’ explain the meaning of each expression.

Find the rule that gives the number of matchsticks required to build the following pattern. Also find the number of matchsticks required to make a pattern with 6 squares at the base.

From an algebraic expression to give the number of line segments required to make the following pattern and hence find the number of line segments required to make the 10th pattern.