Answer:
Number of hours= 20 hours
Step-by-step explanation:
Giving the following information:
Net savings (babysitting)= 250 - 110= $140
Rate per hour= $7
<u>To calculate the number of hours that Melissa worked as a babysitter, we need to use the following formula:</u>
Number of hours= net savings / rate per hour
Number of hours= 140 / 7
Number of hours= 20 hours
The answer is

÷ 2 =

÷
If

÷

=

, then:

÷

=
Now, 2 can be canceled out from

:
The ratio in which Adm, Ming and Clinton sold sandwiches = 4:7:3
Number of sandwiches sold by Ming = 91
Let us assume the common ratio to be = x
Then
7x = 91
x = 91/7
= 13
Then
The number of sandwiches sold by Adm = 4 * 13
= 52
The number of sandwiches sold by Clinton = 3 * 13
= 39
So
The total number of sandwiches
sold by Adm, Ming and Clinton = 52 + 91 + 39
= 182.
So a total of 182 sandwiches were sold by Adm, Ming and Clinton.