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Unit Price of Brand X = 21$

Unit Price of Brand Y = 9$

Assume:

Number of Brand X durians sold = x

Number of Brand Y durians sold = y

 

Equation 1 (number of Brand Y durians sold was 3 times the number of Brand X durians)

y=3x

Equation 2 (Money collected from sale of Brand X durians was $612 less than that of Brand Y durians)

21x + 612 = 9y

21x + 612 = 9(3x)

21x + 612 = 27x

27x – 21x = 612

6x = 612

x = 102

y = 306

 

Total number of Durians = x + y = 408

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Durian X Durian Y
Unit Price $21 $9
Unit sold u 3u
money collected $21u $9(3u)

9(3u) – 21u = 612
27u-21u = 612
6u = 612
u = 102
Total 4u sold ==> 4×102 = 408
Total 408 durians sold

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