Number of equal parts:
4+ 10= 14 (parts)
The value of each part is:
308 diapers/ 14 parts= 22 diapers/ parts
Really dirty diapers account for 4 parts, so the number of really dirty diapers is:
22 diapers/ 1 part* 4 parts= 88 diapers.
There are 88 really dirty diapers~
