Directions: Read the following information to answer the question given below: (x + 5) men can complete a work in (x + 3) days, and (x + 15) men can complete 50% of the same work in 2 days. What is the percent decrease in the number of days, if instead of 10 men doing the work each day, they are assisted by 15 children each day and if each child does as much work in 30 days as done by 1 man in 20 days?