Answer:
30 days
Explanation:
sum the parts of the ratio, 6 + 4 = 10 parts
divide the total amount of loaves by 10 to find the value of one part of the ratio.
20 loaves ÷ 10 = 2 loaves ← value of 1 part of the ratio, then
6 parts = 6 × 2 = 12 loaves ← number of white loaves made per day
4 parts = 4 × 2 = 8 ← number of brown loaves made per day
now divide 240 loaves by number of brown loaves made per day
240 ÷ 8 = 30
number of days to make 240 brown loaves is 30 days