This is the answer ,you should first do the multiplication then the sum.
Answer:
It takes them approximately 27 minutes to mow the lawn if they are working together.
Step-by-step explanation:
Wilma can mow a lawn in 80 minutes. This means she can mow at the rate of 1 lawn in 80 minutes. We can write this rate as R = 1/80
Melissa can mow the same lawn in 40 minutes. This means she can mow at the rate of 1 lawn in 40 minutes. We write the rate as R = 1/40.
Now, if the are working together, we need to determine how long it would take for them to mow a lawn. Let this rate be 1/x.
What we want to find is
1/80 + 1/40 = 1/x
Multiply through by 80, we have
1 + 2 = 80/x
3 = 80/x
Take reciprocals of both sides
x/80 = 1/3
x = 80/3
= 1600 seconds
Approximately 27 minutes
(b) The monthly savings of Juan is $200.
(a) The monthly saving of Juan is $900.
(c) The monthly saving of Juan is $3,600.
As we know that
Savings = Income - expenses
So based on the above formula, the monthly savings in each case is as follows:
(b)
Monthly saving is
= $3,600 - $3,400
= $200
(a)
Monthly saving is
= $3,600 - $2,500
= $900
(c)
Monthly saving is
= $3,600 - $0
= $3,600
Here we assume the x be zero.
Therefore we can conclude that
(b) The monthly savings of Juan is $200.
(a) The monthly saving of Juan is $900.
(c) The monthly saving of Juan is $3,600.
Learn more: brainly.com/question/18051939
Answer:
18 gallons
Step-by-step explanation:
the tank capacity is :
$71.98 ÷ $3.98 = 18 gallons