A hospital cafeteria has 20
2 answers:
Answer:
<h2>There are 106 chairs in the hospital cafeteria.</h2>Step-by-step explanation:
Givens
- There are 20 tables.
- 65% of the tables have 6 chairs at each table.
- 35% of the tables have 4 chairs at each table.
The question is, what's the total number of chairs in the cafeteria?
We know by given that 100% represents 20 tables. We can use the rule of three, to find the number that represents a 65%, that is, if 100% is 20 tables, 65% how many tables would be?
There are 13 tables of 6 chairs at each table.
Similarly, if 100% represents 20 tables, 35% how many tables would represent?
There are 7 tables of 4 chairs at each table.
Then, we need to multiply to find the total number of chairs.
We know that there are 13 tables of 6 chairs, so
We also know that there are 7 tables of 4 chairs, so
Therefore, the total number of chairs is
There are 106 chairs in the hospital cafeteria.
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It takes 9 hrs 19.8 minutes for the student teacher to grade the exams if they worked alone
<u>Solution:</u>
Let the efficiency of the school teacher be “x” and the efficiency of the student teacher be “y”
Here the word efficiency means the rate of doing work
Let the total work to be completed be W
According to the question,
The time taken by the school teacher to complete the work is 7 hrs.
So we can write it in equation form
---- eqn 1
where W is the total work and x is the efficiency
Similarly for student teacher and school teacher doing the work simultaneously, we can write the equation as
Equating eqn 1 and 2
7x = 4x + 4y
3x = 4y
So in ratio x : y = 4 : 3
Now putting value of x = 4 in equation (1) we get total work to be 28
Now, <em>total time taken by the student teacher = total work ÷ efficiency of student teacher</em>
Hence, total time taken by the student teacher = 28 ÷ 3 = 9.33 hrs
= 9 hrs 19.8 minutes
Hence it takes 9 hrs 19.8 minutes for the student teacher to grade the exams if they worked alone