Answer:
His brother will take 3.5 hours or
hours to mow 21 lawns
Step-by-step explanation:
Given:
His brother mows 6 lawns in an hour.
To find the time his brother takes to mow 21 lawns.
Solution:
We will unitary method to find the time he will take to mow 21 lawns.
If 6 lawns are mowed in 1 hour
So, 1 lawn will me mowed in =
hours.
Thus 21 lawns will be mowed in =
hours.
Thus, his brother will take 3.5 hours or
hours to mow 21 lawns
The weight of the object is only dependent on the strength of gravity on that particular object.
Answer:
450 ounces
Step-by-step explanation:
We know that the cost of the mixture
must be the cost of the everyday moisturizing lotion
plus the cost of the self-tanning lotion
, which means
.
The cost of any substance will be the cost per ounce of the substance (c), multiplied by the number of ounces (n), which means C=nc, so we have from the previous formula that we have:

But we also know that the number of ounces of the mixture must be the sum of the number of ounces of the everyday moisturizing lotion with the number of ounces of the self-tanning lotion, so we have

We want to calculate the number of ounces of the self-tanning lotion (
), so we solve for that variable:




And substitute our values in this formula, to get:
