Assume the ratio of really dirty diapers to mildly dirty diapers used is 4 to 10.if there are 308 total diapers used in a 3 day period,how many of them are really dirty?

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~

You must add 5 and 7 which equals 12, then it will be any number greater than 12 to make the last side possible