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Apple seeds= A
Orange seeds= B
A=4B
0.10B+0.15A=420
(10B+15A)/100= 420
10B+15(4B)=420*100
10B+60B= 420*100
70B= 420*100
B= 4200/7=600

Answer: B
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Bunuel
Sue planted 4 times as many apple seeds as she planted orange seeds. 15 percent of the apple seeds grew into trees, and 10 percent of the orange seeds grew into trees. If a total of 420 apple trees and orange trees grew from the seeds, how many orange seeds did Sue plant?

A. 540
B. 600
C. 660
D. 720
E. 760
A = 4* Or

into trees = (15/100)*A + (10/100)*Or
into trees = (15/100)*(4*Or) + (10/100)*Or = (70/100)*Or
Given: (70/100)*Or = 420
i.e. Or = 600

Answer: Option B

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Apple=4Orange → A:O=4:1
Let the amount of seeds plant in Apple=4k; and in Orange=k

Total seeds grown into trees → 15%Apple + 10%Orange = 15%*4K + 10%*k =60%k+10%k=70%k=420
k=420/(70%)=42000/70=600
the question ask for the amount of Orange seeds planted = k =600

Answer: (B) 600
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