Posted by Linsey on Thursday, June 9, 2011 at 11:24am.
Method 1 using Algebra:
Let x=volume of 1% milk in gallons
then (5-x)=volume of 4% milk
5*2%=x*1%+(5-x)*4%
Solve for x:
10=x+20-4x
3x=10
x=3 1/3 gal. (1% milk)
5- 3 1/3 = 1 2/3 gal. (4% milk).
Method 2 (mental calculations)
Mentally put the 1% and 4% on a linear scale as follows:
1%..................................4%
The target percentage is 2%:
1%......2%..............4%
Take the difference:
.....1.............2.........
these are the ratio of the 4% and 1% milk respectively (note the inversion of position), i.e.
4% milk : 1% milk = 1:2
Therefore
volume of 4% = 5*1/(1+2)=1 2/3 gal
volume of 1% = 5*2/(1+2)=3 1/3 gal.
Related Questions
Health - Based upon the government’s research, they recommend that we do ...
algebra - A reduced fat cookie contains 9g of fat per sereving. In order for ...
Computer programming - Submit pseudocode for the following programming exercise...
Programming - Submit pseudocode and a flowchart for the following programming ...
math - How many gallons of milk containing 5% butter fat must be mixed with 100 ...
business - Ziggy’s Famous Yogurt blends regular yogurt that is 3% fat with ...
Math - A reduced fat cookie vontains 6g of fat per serving. In order for food to...
math - A reduced fat cookie contains 7g of fat per serving. In order for food to...
math - A reduced fat cookie contains 2g of fat per serving. In order for food to...
Algebra - A reduced fat cookie contains 12g of fat per serving. In order for ...
For Further Reading
