A and b can do a piece of work in 12 days. If a alone have to finish the job among b and c so
A and b=12
A (24 days alone without b)
So if b and c 15 days and c 20 days. If a have to do all I would add 24 and 15 and 20 which would be 59 days
Answer:
The answer is 7 : 48.
Step-by-step explanation:
First, you can to calculate how many students are there in Jill's grade by adding the number of students who have pet with the students without pets :
total = 41 + 7 = 48
Next, you have to find the ratio of students without pets to total students :
7 : 48
Answer:
6 months
Step-by-step explanation:
27 + 8x = 75
x = months which is what you're trying to figure out
1. subtract 27 from 27 and 75
2. then you have 8x = 48
3. divide both sides by 8 so x=6
4. 6 months
You have to compute the prices of the two alternatives after
deducting discount based on the different percentage given.
First alternative: $19.99 – ($19.99 x 20%) = $15.99
Second alternative: $17 – ($17 x 10%)
= $15.30
Therefore, the alternative where
there will be a 10% off on the original price of $17 for a book is cheaper.
7 L of one solution is mixed with 3 L of another, making a new solution with a total volume of 10 L and concentration 29%. This means the new solution contains
(10 L) * 29% = (10 L) * 0.29 = 2.9 L
of acid.
Let the concentration of the first solution be <em>c</em>%. Each liter of the 15% acid solution contributes 0.15 L, and each liter of the solution of unknown concentration contributes 0.01<em>c</em> L of acid. To end up with a total of 2.9 L of acid, we would get
7 * (0.01<em>c</em> L) + 3 * (0.15 L) = 2.9 L
Solve for <em>c</em> (we can omit the units):
0.07<em>c</em> + 0.45 = 2.9
0.07<em>c</em> = 2.45
<em>c</em> = 35
So the first solution has a concentration of 35%.
