A box contains some chikoos, kiwis and starfruits. 0.6 of the chikoos is equal to 40% of the kiwis. The number of starfruits is ⁵₇ of the total number of kiwis and chikoos. If there are 20 less kiwis than starfruits, how many fruits are there in the box altogether?

Chikoos	Kiwis	Starfruits
2x7	3x7
7x5		5x5
14 u	21 u	25 u

0.6 = ⁶₁₀= ³₅
40% = ⁴⁰₁₀₀ = ²₅

0.6 of the chikoos is equal to 40% of the kiwis. Make the numerators the same.  LCM of 3 and 2 is 6.

3x25x2 of the chikoos = 2x35x3 of the kiwis
610 of the chikoos = 615 of the kiwis 

Chikoos : Kiwis
10 : 15 _(÷5)
2 : 3

The total number of chikoos and kiwis is repeated.  Make the total number of chikoos and kiwis the same.  LCM of 5 and 7 is 35.

Number of less kiwis than starfruits
= 25 u - 21 u
= 4 u

4 u = 20

1 u = 20 ÷ 4 = 5

Number of the fruits in the box altogether
= 14 u + 21 u + 25 u
= 60 u
= 60 x 5
= 300

Answer(s): 300