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
Gemiola [76]
3 years ago
7

The average age of staff in the maths department is 40.

Mathematics
1 answer:
pashok25 [27]3 years ago
6 0

Answer:

Cerian is 28 years old

Step-by-step explanation:

The given parameters are;

The average age of the staffs in the mathematics department = 40

The number of staffs in the department = 7

The average age of Jill, Nicky and Wendy = 41

The average age of Andy, Alan and Cathy = 43

From the given parameters, we have;

The average age of the staffs in the mathematics department = (The sum total of the ages of the members of the math department)/(The number of staffs in the department)

Therefore;

40 = (The sum total of the ages of the members of the math department)/ (7)

From which we have;

The sum total of the ages of the members of the math department = 40 × 7 = 280

Which gives;

Jill's age + Nicky's age + Wendy's age + Cathy's age + Cerian's age + Alan's age + Andy's age = 280 years

The average age of Jill, Nicky and Wendy = 41

Given that Jill, Nicky, and Wendy make up 3 of the 7 members of staffs, we have;

The average age of Jill, Nicky and Wendy = (The sum total of the ages of Jill, Nicky, and Wendy)/(The number of staff Jill, Nicky, and Wendt make)

Therefore;

The sum total of the ages of Jill, Nicky, and Wendy = 41 × 3 = 123

Which gives;

Jill's age + Nicky's age + Wendy's age = 123 years

Similarly, the sum total of the ages of Andy, Alan, and Cathy = 43 × 3 = 129

Which gives;

Andy's age + Alan's age + Cathy's age = 129 years

Therefore;

Cerian's age = (Jill's age + Nicky's age + Wendy's age + Cathy's age + Cerian's age + Alan's age + Andy's age) - (Jill's age + Nicky's age + Wendy's age) + (Andy's age + Alan's age + Cathy's age)

∴ Cerian's age = 280 years - 123 years - 129 years = 28 years

You might be interested in
An atom of a certain element has 37 protons, 37 electrons, and a mass number of 85. How many neutrons are
Harrizon [31]

Answer:

There will be 48 neutrons.

Step-by-step explanation:

Hope this helps and have a great day :)

5 0
3 years ago
Written equation for y=-2=1 (0,3)
Alika [10]
Is that supposed to be y=-2x+1?
i cannot solve without the proper equation lol 
4 0
3 years ago
Please help I’ll mark you as brainliest if correct
laila [671]

Answer:

the answer is A. because a 1/2 inch is 2 feet there is about 2 and 1/2 of an inch so if you add that, that will be 9 feet

Step-by-step explanation:

6 0
3 years ago
If another 10-year old were to join the baseball team shown in the scatter plot below, what is the best estimate for his height?
MissTica

Answer:

55

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Please answer these questions it's very urgent please​
vesna_86 [32]

Answer:

29) 10

Step-by-step explanation:

the other I can't do...

7 0
2 years ago
Read 2 more answers
Other questions:
  • Students who attend Washington Middle School are either in seventh or eighth grade. At the end of the first semester 25% of the
    10·1 answer
  • What is the area of rectangle whose<br> height is 2.5 in and base is 12 in?
    7·1 answer
  • What is the perimeter of a square with side length 5 4/5? As a mixed number.
    6·2 answers
  • Factor the expression.
    10·1 answer
  • A = bh; solve for h<br> h =
    15·1 answer
  • an iPad was on sale for 3/4 of its original price. if the original price was 1000 what was the sale price?
    5·1 answer
  • Angie baked 100 cookies and 20 brownies.She wants to switch them into equal groups in the bank so each group must have the same
    6·1 answer
  • Write a differential equation that fits the physical description. The velocityvelocity of a particle movingof a particle moving
    5·1 answer
  • Combine like terms:
    14·1 answer
  • Lisa earns $81 washing 9 windows. At this rate, how much does Lisa earn washing 5 windows?​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!