Find the unknown side length for the rectangle.
2 answers:
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Answer:
5 friends.
Step-by-step explanation:
Let x be the number of friends,
Since, each had 2/5 of a bag of peanuts left over,
Thus, the total numbers of bag left = 2/5 of the number of friends,
According to the question,
Hence, there were 5 friends.
Answer:
We have to add 1.86 L of water to make the solution 7% saline.
Step-by-step explanation:
The concentration of a saline solution is given by
C(x) =
where x represents the amount of water used to dilute the solution.
We have to find how much water must be added to obtain a solution that is 7% saline.
If we see the equation we notice that as we add the value of x, the concentration of the solution decreases.
Here C(x) = 0.07
0.07 =
Rearranging,
1 + x =
1 + x = 2.86
x = 1.86 L
We have to add 1.86 L of water to make the solution 7% saline.