The formula to find the spring constant, , for a spring with potential energy, , that has been stretched by length, , is shown b
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The r% of a quantity x is computed by dividing x in 100 parts, and considering r of such parts. So, the r% of the male is
and similarly, the r% of female is
The number of males decreased by this quantity, so now it is
and the number of female increased by this quantity, so now it is
we know that these two new counts are the same number, so we can build and solve the equality
Subtract 20 and add 0.3r from both sides:
Divide both sides by 0.5 to solve for r:
Let's check the answer
The 20% of 30 is , while the 20% of 20 is 4. So, we are stating that
which is true because both expressions evaluate to 24.
Given that 
and 
, if 
is an arithmetic sequence, then the common difference between successive terms is 
.
You then have
So the explicit formula for the
th term is
You then have
So the explicit formula for the