Explanation

To find how many more men are needed, we can use the formula for work:

$$text{Work} = text{Men} times text{Days}$$

Initially, 120 men can complete the work in 90 days. The total work can be represented as:

$$120 times 90 = 10800 text{ man-days}$$

Now, we need to find how many men are needed to complete the work in 40 days:

$$text{Required Men} = frac{10800}{40} = 270 text{ men}$$

Explanation

Explanation

Because you aren't given the cost of any book, you can plug in your own values.

Let's say that the average cost of the textbooks, excluding the anatomy textbook, is $10.

You can make all the books cost $10 each to make the problem easier.

The anatomy textbook would cost $30.

The total cost of all the textbooks would be $130.

The anatomy textbook would be $30/$130=3/13

Explanation

Explanation

• Total of 5 numbers: $$5x 6.9 = 34.5
  
• Total of 4 numbers:4×4.4=17.6
• Deleted number: $$34.5 - 17.6 = 16.9