Answer:
Step-by-step explanation:
A construction manager needs 12 workers to complete a building project in 54 days, we can write;
12 workers = 54 days
T find the number of workers needed to complete the same project in T days, we will write;
x workers = T days
Divide both equations
12/x = 54/T
Cross multiply
12T = 54x
x = 12T/54
x = 2T/9
Hence the number of workers needed to complete the same project in T days is 2T/9 workers
Answer:
There are 72 books on all the three shelves.
Step-by-step explanation:
Given:
On the bottom shelf there are half as many books as on the other two shelves.
On the middle shelf there are three times less than on the other two shelves.
On the top shelf there are 30 books.
Now, to find the books on all three shelves.
Let the books on the middle shelf be
The books on the top shelf are 30.
The books on the bottom shelf =
So, the books on the middle shelf:
Multiplying both sides by 2 we get:
Subtracting both sides by we get:
Dividing both sides by 5 we get:
Thus, the books on middle shelf are 18.
Now, to get the books on the bottom shelf by substituting the value of :
Hence, the books on the bottom shelf are 24.
Now, to get the total books on all the three shelves we add the books of top, middle and bottom shelf:
Therefore, there are 72 books on all the three shelves.
-15/2 is the answer, Hope this helps;)
Let Brandon's age be = b years
Let Michael's age be = m years
As Michael is 12 years older than Brandon, Michael's age, so
Seventeen years ago, Michael was 4 times as old as Brandon, so
Substitute m=b+12
Hence, Brandon's age is 21 years
As m=b+12
Hence, Michael's age is 33 years.