Mrs Chiam baked some muffins of three flavours, which were cranberry, cherry and blueberry. She baked twice as many cranberry muffins as cherry muffins and thrice as many blueberry muffins as cranberry muffin. Given that she baked 100 more blueberry muffins than cherry muffins, how many muffins did she bake?
Number of cherry muffins = 1 u
Number of cranberry muffins = 2 u
Number of blueberry muffins = 3 x 2 u = 6 u

Number of more blueberry muffins than cherry muffins
= 6 u - 1 u 
= 5 u

5 u = 100

1 u = 100 ÷ 5 = 20

Number of cranberry muffins
= 2 u
= 2 x 20
= 40

Number of blueberry muffins
= 6 u
= 6 x 20
= 120

Total number of muffins that he baked
= 20 + 40 + 120
= 180

Answer(s): 180