Question

This passage describes tusks in African elephants.

an African elephant with tusks
Many African elephants have large tusks, which they use for digging and fighting.
However, elephant tusks are the main source for a valuable material called ivory. Illegal hunters called poachers may kill elephants to get tusks for ivory. These poachers are more likely to kill elephants with tusks than elephants without tusks.
The table below describes a possible population of African elephants at the start of a period of time and at the end of that period. The table shows the tusks trait in the population at each point in time.
Complete the table. Write the exact answers as whole numbers or decimals.
Data about a population of African elephants
Point in time Number with tusks Number without tusks Percentage with tusks Percentage without tusks
Start 57 193
%
%
End 79 21
%
%

Answer 1

To complete the table, we need to calculate the percentages of African elephants with and without tusks at both the start and the end points in time.

### Calculating for the Start:
1. **Total number of elephants at the start**:
\[
\text{Total} = \text{Number with tusks} + \text{Number without tusks} = 57 + 193 = 250
\]

2. **Percentage with tusks**:
\[
\text{Percentage with tusks} = \left(\frac{57}{250}\right) \times 100 = 22.8\%
\]
(rounded to one decimal place is 22.8%)

3. **Percentage without tusks**:
\[
\text{Percentage without tusks} = \left(\frac{193}{250}\right) \times 100 = 77.2\%
\]
(rounded to one decimal place is 77.2%)

### Calculating for the End:
1. **Total number of elephants at the end**:
\[
\text{Total} = \text{Number with tusks} + \text{Number without tusks} = 79 + 21 = 100
\]

2. **Percentage with tusks**:
\[
\text{Percentage with tusks} = \left(\frac{79}{100}\right) \times 100 = 79.0\%
\]

3. **Percentage without tusks**:
\[
\text{Percentage without tusks} = \left(\frac{21}{100}\right) \times 100 = 21.0\%
\]

### Completed Table:
Here's the completed table with the calculated percentages:

| Point in time | Number with tusks | Number without tusks | Percentage with tusks | Percentage without tusks |
|---------------|--------------------|----------------------|-----------------------|--------------------------|
| Start | 57 | 193 | 22.8% | 77.2% |
| End | 79 | 21 | 79.0% | 21.0% |