answer:

You can do trial and error on this one. Having the choices makes this easier to answer

Let x represent the trees

5: 2: 8 = 1245

5x+2x+8x = 1245

15x = 1245

15x/15 = 1245/15

x = 83

evaluate x as 83

5x+2x+8x = 1245

5(83)+2(83)+8(83) = 1245

415+166+664 = 1245

1245 = 1245

final answer:

there are 415 mango trees, 166 guava trees and 664 avocado trees.

5: 2: 8 = 1245

5x+2x+8x = 1245

15x = 1245

15x/15 = 1245/15

x = 83

evaluate x as 83

5x+2x+8x = 1245

5(83)+2(83)+8(83) = 1245

415+166+664 = 1245

1245 = 1245

final answer:

there are 415 mango trees, 166 guava trees and 664 avocado trees.

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