Arate that describes how much smaller or larger the scale drawing is than the real object

13.33%

say 50 oranges, then 100 apples

80 are red, 20 are yellow

total fruit = 150

20chances out of 150 for yellow

20/150 = 13.33%

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.