Anational park has a population of 400 koalas. if the koala population is expected to increase by 3% p. a., the expected number of koalas in the national park in 4 years, time will be:
a) 448
b) 450
c) 480
d) 500

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint