Conservationists 62994

Conservationists planted a total of 695 trees of three species. There were 65 spruces more than pine trees and the first three times less than pines. How many trees of each species were planted?

Correct answer:

s =  335
b =  270
j =  90

Step-by-step explanation:

s+b+j=695 s=65+b j=b/3  b+j+s=695 bs=65 b3j=0  Row2Row1Row2 b+j+s=695 j2s=760 b3j=0  Row3Row1Row3 b+j+s=695 j2s=760 4js=695  Pivot:Row2Row3 b+j+s=695 4js=695 j2s=760  Row341 Row2Row3 b+j+s=695 4js=695 1.75s=586.25  s=1.75586.25=335 j=4695+s=4695+335=90 b=695js=69590335=270  b=270 j=90 s=335

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