This is a test of commonsense. Complete the next sentence:

How to count the blades of grass on your lawn
Choose a corner or edge of your lawn to start with.
Do not start in the middle because you will get confused.
Get some cones to cover up parts of the lawn which you have already counted, so you don't lose your place.
Try to count all blades in one sitting-if you try to go away and come back, you might just get very confused. Start early in the morning so that you'll have a full day of sunlight to work with.