Answer:
175
Explanation:
1. an (any term) = 27
2. a1 (first term) = -7
3. d (common difference) = 7
• Use the explicit formula:
an = d(n - 1) + a1
a27 = 7(27 - 1) - 7
- Subtract inside the parenthesis ():
a27 = 7(26) - 7
- Distribute:
a27 = 182 - 7
- Subtract:
a27 = 175
Let's find the required ratios first: to get to the relative percentages, we'll simply have to multiply by 100.
Since there are 16 girls, 10 boys and 9 adults, there are

people in total.
So, the ratio of girls is

The ratio of boys is

The ratio of adults is

Step-by-step explanation:
( u ÷ v - t ) + w
divide u and v, after u get the ans subtract it with T.
then add w.