1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bad White [126]
2 years ago
13

Twin brothers,billy and Bobby, can mow their grandparents lawn together in 72 minutes. Billy could mow the lawn by himself in 15

minutes less time that it would take Bobby. How long will it take Bobby to mow the lawn by himself?
Mathematics
1 answer:
Alla [95]2 years ago
6 0

Answer:

Billy used 28 mins 30 sec to mow the lawn and Bobby used 43 mins 30 sec to now the lawn both within 72 mins

Step-by-step explanation:

let x represent Billy

let x+15 represent Bobby

x + x + 15 = 72

2x = 72 - 15

2x = 57

2x/2 = 57/2

x = 28.5 minutes = 28 minutes 30 seconds

Bobby = x + 15

= 28.5 + 15

= 43.5 minutes= 43 minutes 30 seconds

You might be interested in
In the population of New Town, 30 percent of the people work for Bigg Corporation, 50 percent work in the public section, and 20
Crazy boy [7]

Answer: Stratified Random Sample

Step-by-step explanation:

The sample is a stratified random sample in the sense that each of the population that was sampled consisted of the necessary groups that need to be considered in their right proportion of representation which makes the sample valid for us to reasonably draw a conclusion of what to expect in the larger sample space. This sample favours every possible member of the population and helps us adequately plan for all

8 0
3 years ago
Write a real-world problem to compare fractions.then solve the problem
andrew11 [14]

The fraction computed shows that the total quantity of meat that Joy bought is 5/6kg.

<h3>How to solve the fraction?</h3>

The fraction can be explained thus: Joy bought 1/2kg of meat from a store and bought 1/3kg of meat from store B. What is the total quantity of meat that Joy bought?

The total quantity of meat that Joy bought will be:

= 1/2 + 1/3

= 5/6

In conclusion, the correct option is 5/6kg.

Learn more about fractions on:

brainly.com/question/78672

6 0
2 years ago
=
Savatey [412]

Answer: 8 hours

Step-by-step explanation: First, find the unit rate. For one hour of work, she earns 0.05263157894. Multiply this number 152.

4 0
2 years ago
A tank contains 3,000 L of brine with 15 kg of dissolved salt. Pure water enters the tank at a rate of 30 L/min. The solution is
Shalnov [3]

Answer:

Step-by-step explanation:

Volume of tank is 3000L.

Mass of salt is 15kg

Input rate of water is 30L/min

dV/dt=30L/min

Let y(t) be the amount of salt at any time

Then,

dy/dt = input rate - output rate.

The input rate is zero since only water is added and not salt solution

Now, output rate.

Concentrate on of the salt in the tank at any time (t) is given as

Since it holds initially holds 3000L of brine then the mass to volume rate is y(t)/3000

dy/dt= dV/dt × dM/dV

dy/dt=30×y/3000

dy/dt=y/100

Applying variable separation to solve the ODE

1/y dy=0.01dt

Integrate both side

∫ 1/y dy = ∫ 0.01dt

In(y)= 0.01t + A, .A is constant

Take exponential of both side

y=exp(0.01t+A)

y=exp(0.01t)exp(A)

exp(A) is another constant let say C

y(t)=Cexp(0.01t)

The initial condition given

At t=0 y=15kg

15=Cexp(0)

Therefore, C=15

Then, the solution becomes

y(t) = 15exp(0.01t)

At any time that is the mass.

5 0
3 years ago
Equations
Flauer [41]

Answer:

Step-by-step explanation:

-3x + 4y = -18

8x - 4y =   28

5x = 10

x = 2

4 - y = 7

-y = 3

y = -3

(2, -3)

8 0
3 years ago
Read 2 more answers
Other questions:
  • Given: ABCD is a parallelogram m∠A = 60º ; BK ⊥ AD AK = KD; Perimeter of ABCD = 24 Find: BD.
    11·1 answer
  • Please solve this qn.​
    7·1 answer
  • Write the subtraction sentence that has a difference of 10
    15·2 answers
  • A jet travels 510 miles in 2 hours at this rate how far could the jet fly in 14 hours what have the rate of speed of the jet
    13·2 answers
  • Need help with number 16
    10·1 answer
  • What is the domain of f(x) = cos(x)?
    11·2 answers
  • Deidre spent half of the money she made babysitting on new shoes. If she babysat for 6 hours and charged $8.75 per hour, how muc
    10·2 answers
  • I hate y'all just waisting my póints (╥﹏╥)​
    7·1 answer
  • for every left-handed person there are 4 right handed people. if there are 30 students how many students who are right-handed
    11·1 answer
  • find the simple interest on a sum of rupees 2,000 at 11/2% per annum for 8 June 2015 to 19th August 2015​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!