John made $20 for 2 hours of work. Sally made $50 for 4 hours of work. How do John and Sally's hourly pay rate compare?

2 answers:

6 0

20/2= 10

John makes 10 dollars an hour.

50/4= 12.5

Sally makes 12.50 dollars an hour.

Sally makes more than John.

I hope this helps!
~kaikers

vlabodo [156]3 years ago

3 0

John gets $10 per hour and Sally makes $12.50 per hour so Sally makes $2.50 more then John per hour.

We can tell John makes $10 per hour because we divid how much he made by the amount of hours it took to make to get 10 and we did the same thing for Sally ($50/4=12.5) and then we subtract Sally's pay per hour by John's pay per hour to see how much more Sally makes per hour.

I hope that helped and made sense. :)

You might be interested in

Please help me with this.

OLga [1]

Swapping rows alters the sign of the determinant:

$\begin{vmatrix} x & y & z \\ -8 & 2 & -12 \\ u & v & w \end{vmatrix} = - \begin{vmatrix} x & y & z \\ u & v & w \\ -8 & 2 & -12 \end{vmatrix}$

Multiplying a single row by a scalar scales the determinant by the same amount:

$\begin{vmatrix} x & y & z \\ u & v & w \\ -8 & 2 & -12 \end{vmatrix} = -2 \begin{vmatrix} x & y & z \\ u & v & w \\ 4 & -1 & 6 \end{vmatrix}$

Then

$\begin{vmatrix} x & y & z \\ -8 & 2 & -12 \\ u & v & w \end{vmatrix} = -(-2) \begin{vmatrix} x & y & z \\ u & v & w \\ 4 & -1 & 6 \end{vmatrix} = 2\times(-6) = \boxed{-12}$