Homework#1
aa = amount of 30% saline solution
bb = amount of 50% saline solution0.45(800) = 360
Amount of Solution
Saline
aa bb 800800
0.30a0.30a 0.50b0.50b 360360
+ =30%solution
50%solution
45%solution
a b 800
0.30a 0.50b 360
Jenny mixes a 30% saline solution with a 50% saline solution to make 800 milliliters of a 45% saline solution. How many milliliters of each solution does she use?
#1
200 ml of 30% solution200 ml of 30% solution600 ml of 50% solution600 ml of 50% solution
Homework
Jenny mixes a 30% saline solution with a 50% saline solution to make 800 milliliters of a 45% saline solution. How many milliliters of each solution does she use?
aa = amount of 30% saline solution
bb = amount of 50% saline solution
a b 800
0.30a 0.50b 360 30a 50b 36000
30a 30b 24000
20b 12000b 600a 200
Homework
Peanuts cost $1.60 per pound and raisins cost $2.40 per pound. Brad wants to make 8 pounds of a mixture that costs $2.20 per pound. How many pounds of peanuts and raisins should he use?
#2
P = amount of peanuts (lbs.).
R = amount of Raisins (lbs.)
Amount (lbs)
Cost ($)
P R 8
+ = MixturePeanuts Raisins
1.60P 2.40R 17.60
P R 8
1.6P 2.4R 17.6
2.20(8) = 17.60
Homework
Peanuts cost $1.60 per pound and raisins cost $2.40 per pound. Brad wants to make 8 pounds of a mixture that costs $2.20 per pound. How many pounds of peanuts and raisins should he use?
#2
P = amount of peanuts (lbs.).
R = amount of Raisins (lbs.)P R 8
1.6P 2.4R 17.6 16P 24R 176
16P 16R 128
8R 48R 6P 2
2 pounds of Peanuts2 pounds of Peanuts6 pounds of Raisins6 pounds of Raisins
Homework#3
aa = amount of 10% aspirin
bb = amount of 25% aspirin0.16(10) = 1.6
Amount of medicine
aspirin
aa bb 1010
0.10a0.10a 0.25b0.25b 1.61.6
+ =10% 25% 16%
a b 10
0.10a 0.25b 1.6
A pharmacist wants to mix medicine that is 10% aspirin with a medicine that is 25% aspirin to make 10 grams of a medicine that is 16% aspirin. How many grams of each medicine should the pharmacist mix together?
Homework#3
aa = amount of 10% aspirin
bb = amount of 25% aspirina b 10
0.10a 0.25b 1.6
A pharmacist wants to mix medicine that is 10% aspirin with a medicine that is 25% aspirin to make 10 grams of a medicine that is 16% aspirin. How many grams of each medicine should the pharmacist mix together?
10a 25b 160
10a 10b 100
15b 60b 4a 6
6 grams of the 10% aspirin6 grams of the 10% aspirin4 grams of the 25% aspirin4 grams of the 25% aspirin
Homework
A coffee shop plans on selling it’s house blend for $8.50 per pound. The mix will be made from Mexican beans that cost $7 per pound, with Costa Rican beans that cost $9 per pound. How many pound of Costa Rican beans are needed to make 150 pounds of the house blend?
#4
M = amount of Mexican beans (lbs.).
C = amount of Costa Rican beans (lbs.)
Amount (lbs)
Cost ($)
M C 150
+ = BlendMexican Costa Rican
7M 9C 1275
M C 150
7M 9C 1275
8.50(150) = 1275
Homework
A coffee shop plans on selling it’s house blend for $8.50 per pound. The mix will be made from Mexican beans that cost $7 per pound, with Costa Rican beans that cost $9 per pound. How many pound of Costa Rican beans are needed to make 150 pounds of the house blend?
#4
M = amount of Mexican beans (lbs.).
C = amount of Costa Rican beans (lbs.)
M C 150
7M 9C 1275
7M 7C 1050
2C 225C 112.5112.5 pounds of Costa Rican beans112.5 pounds of Costa Rican beans