SOLUTION: Hi A store owner has a pound of a mixture of nuts that is 90% peanuts and 10% Brazil nuts by weight. How much weight in Brazil nuts must be added to make the mixture 75% peanuts.

Question 1183489: Hi
A store owner has a pound of a mixture of nuts that is 90% peanuts and 10% Brazil nuts by weight. How much weight in Brazil nuts must be added to make the mixture 75% peanuts.
Thanks
Found 2 solutions by josgarithmetic, greenestamps:
Answer by josgarithmetic(39621) (Show Source): You can put this solution on YOUR website!
b mass units of Brazil Nuts to add.

Assuming some 100 units of original mixture,
and understanding the resulting mixture is expected to be 25% Brazil nuts,

.
.
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!

As a fraction, the part of the original mixture that is peanuts is

After additional amount x of Brazil nuts is added to the mixture, the fraction that is peanuts is

The fraction of the mixture that is peanuts is now 3/4:

ANSWER: 0.2 pounds of Brazil nuts must be added to make the mixture 75% peanuts.

RELATED QUESTIONS
The owner of a candy store wants to mix some peanuts worth $2 per pound, some cashews... (answered by lwsshak3,josgarithmetic)
The owner of a candy store wanted to mix peanuts selling for $2 per pound, cashews... (answered by josmiceli)
The owner of a candy store wants to mix some peanuts worth $4 per pound, some cashews... (answered by richwmiller)
The owner of a candy store wants to mix some peanuts worth $2 per pound, some cashews... (answered by josgarithmetic)
A store owner sells cashew nuts $5.00 a pound and peanuts $1.50 a pound the owner decides (answered by josgarithmetic)
the owner of candy store mixed some peanuts worth $3per pound some cashews worth $9 per... (answered by QH)
Oh Nuts! sells cashews for $6.75 per pound and Brazil nuts for $5.00 per pound. How much... (answered by stanbon)
Macadamia nuts cost $.90 per ounce, peanuts cost $.30 per ounce, an cashews cost $1.30... (answered by ptaylor)
A specialty store owner mixes peanuts worth 3.60 per pound with cashew nuts worth 8.40... (answered by jorel555)