George went to school for 216 days in a full year. If his attendance in 60%, find the number of days on which the school was opened.

Given:

days present = 216 days

percentage of presence = 60%

Find the total number of days the school was opened.

216 days is the part of a whole. 60% is the percentage of the part to the whole.

To get the whole, we need to divide the part by its percentage

216 : 60% = 360 days

The school was opened for 360 days.

Hi

216 days ⇒ 60%

x days ⇒ 100%

60x = 216·100

60x = 21600

x = 21600/60

x = 2160/6

x = 360 days

Answer: 360 days