The number of dragon fruits Tommy bought in September was 20% more than in August. In October, he bought 70% less dragon fruits than in September. If there were 176 less dragon fruits in October than August, how many dragon fruits did Tommy buy in September?

August	September	October
5x5	6x5
	10x3	3x3
25 u	30 u	9 u

100% + 20 = 120%
120% = ¹²⁰₁₀₀ = ⁶₅
September : August = 6 : 5 

100% - 70% = 30%
30% = ³⁰₁₀₀ = ³₁₀
October : September = 3 : 10

The number of dragon fruits in September is repeated.  Make the number of dragon fruits in September is the same.  LCM of 6 and 10 is 30.

Number of less dragon fruits in October than August
= 25 u - 9 u
= 16 u

16 u = 176

1 u = 176 ÷ 16 = 11

Number of dragon fruits that Tommy bought in September
= 30 u
= 30 x 11
= 330

Answer(s): 330