4 quarters make a whole.
1 whole = 4 quarters.
For example, if we consider a circle, dividing it into four equal sections results in quarters. Each quarter represents 25% of the whole circle, and when combined, they make up the complete circle. Similarly, in the context of time, a year is often divided into four quarters—each comprising three months—and collectively they constitute the entire year.
When referring to a whole, it means considering something complete or in its entirety. In the context of quarters, breaking the whole into four equal parts or quarters constitutes the complete unit.