![famouzgal](/avatars/39202.jpg)
famouzgal
16.10.2019 •
Mathematics
You are making 10 tons of concrete that is 37.9% cement by mixing a 25% cement mixture with a 68% cement mixture.
a) how much of the 68% cement mixture must you use?
b) how much of the 25% cement mixture must you use?
Solved
Show answers
More tips
- F Family and Home When and how to start introducing solid foods to your baby?...
- B Business and Finance Moneybookers – What it is and How it Works...
- C Computers and Internet How to Format Your C Drive: Detailed Guide and Tips...
- F Food and Cooking What can and cannot be eaten during Lent?...
- H Health and Medicine What to Do When Your Jaw Locks Up?...
- F Family and Home Why Having Pets at Home is Good for Your Health...
- D Dating, Love, Relationships Is it a Compliment or Flattery: What s the Difference?...
- S Science and Technology The Metric System in Our Daily Life: Understanding Its Importance...
- C Computers and Internet What to Do If Your ICQ Gets Hacked?...
- C Computers and Internet How to Choose a Monitor?...
Answers on questions: Mathematics
- M Mathematics Free points and what s 5/2...
- M Mathematics dave is painting a fence in his uncle s yard he painted 2 sections of the fence in 30 minutes Dave has 9 sections to paint. if Dave paints at the same rate how many minutes will it...
- M Mathematics Kyle collected 7 smooth stones 5 jagged stones and 3 shells at the beach. which fraction is equivalent to the fraction of his collection that is stones?...
- C Chemistry The problem: hurricane oatis, a category 5 storm, leaves you stranded for days on long island without electricity, transportation, internet, and clean water. you turn on the faucet,...
- M Mathematics Walter is to make cookies for a basketball tournament. he s made 15 cookies so far. his coach asked him to make at least 20 cookies but no more than 55. solve the inequality and interpret...
- E English According to the narrator, what historically has driven so many people mad, both white and black ? a. the choice between hatred and crippling injustice b. the continual presence of...
- G Geography Despite worldwide effort to move towards renewable energy, the majority of the world s energy demand is met by which of the following fuel sources? Electricity Fossil Fuels Solar...
- M Mathematics Please help me with this problem...
Ответ:
Let the 25% mixture be x tons
Then the 68% mixture will be (10 -x) tons.
Using formula for mixtures:
Let p for percentage and w for weight in tons.
p₁w₁ + p₂w₂ = pw
25*x + 68*(10-x) = 37.9*10
25x + 680 - 68x = 379
680 - 43x = 379
680 - 379 = 43x
301 = 43x
43x = 301
x = 301/43
x = 7
Recall that x, was for the 25% mixture, 7 tons.
a) For the 68% mixture, = 10 - x = 10 -7 = 3 tons.
b) For the 25% mixture = x = 7 tons.
Ответ:
explanation