Data:
Total number of shirts: 40
Children sized: 2/5 of 40
To find the number of shirts that are adult sized:
As 2/5 of the shirts are children sized substract it from the total number of shirts to find the number of adult shirts (X):
2/5 is equal to multiply 40 by 2/5, then you have the next equation:

Evaluate and solve for x:

Then, there are 24 adult sized shirts in the order