Question

There are 26 rooms in a school. Each room has 4 plants. If each plant needs 2 cups of water, how much water do we need for all the plants?

Answer 1

Total number of rooms in the school = 26
Number of plants in each room = 4
Total number of plants in the school = 4 × 26
= 104
Working:

$\begin{array}{ccc}& 2& 6\\ & \times & 4\\ 1& 0& 4\\ & & \end{array}$

Number of cups of water required by 1 plant = 2
Number of cups of water required by 104 plants = 2 × 104
= 208
Working:



Thus, we need 208 cups of water for all the plants.