A30% solution of fertilizer is to be mixed with 60% solution of fertilizer to get 150 gallons of 50% solution. how many gallons of each solution is needed?

Ratio of 30% to 60% solution
= 60-50 : 50-30
= 1:2
Volume of 30% solution
=150*(1/(1+2)=50 gal.
Volume of 60% solution
=150*(2/(1+2)=100 gal
Check: 50+100=150 gal. ok
concentration: (50*.3+100*.6)/150=75/150=50%  ok

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The key is the word about, they want an estimation.63 is closer to 60, 71 is closer to 7060 + 70 = 130ryan counted about 130 birds