Question
1) A party mi is made from pretzels that cost $2 lb. and cereal that costs $2.40 lb. If a total of 4 pounds is made and the cost for the mix is $2.15 a pound, how many pounds of each ingredient are used?
2) When the tens digit of a two digit number is added to three times the ones digit, the sum is 31. If the digits are added, the sum is 15. what is the original number?
2) When the tens digit of a two digit number is added to three times the ones digit, the sum is 31. If the digits are added, the sum is 15. what is the original number?
Answers
andra
Please Check it - I think I may have figured it out.
1) 1/2 lb cereal and .48 lb. of pretzels
2) 78
Am I right? :-)
1) 1/2 lb cereal and .48 lb. of pretzels
2) 78
Am I right? :-)
Steve
#1 is obviously wrong, since your weights don't add up to the desired 4 lbs. If there are x lbs of pretzels,
2x + 2.4(4-x) = 2.15*4
x = 2.5
so, 2.5 lbs pretzels and 1.5 lbs cereal
#2 correct
2x + 2.4(4-x) = 2.15*4
x = 2.5
so, 2.5 lbs pretzels and 1.5 lbs cereal
#2 correct
Jeb
Did you find these two problems on a cumulative review?