A thanksgiving ceremony was attended by men, women and children. The ratio of men to women to children was 5:7:1. There were 60 children in the ceremony. Determine:

Let the number of men be $5x$, women be $7x$, and children be $3x$.
Given that the number of children is 60:

Number of men $= 5x = 5 \times 20 = 100$.
The final answer is $\boxed{\text{100 men}}$.

Number of women $= 7x = 7 \times 20 = 140$.

Difference = Number of women - Number of men

The final answer is $\boxed{\text{40 more women}}$.

The total work is proportional to $M \times H \times D$. Since the work is the same, we can write:

Given:
$M_1 = 5$ men, $H_1 = 6$ hours/day, $D_1 = 12$ days
$M_2 = 3$ men, $H_2 = 8$ hours/day, $D_2 = ?$ days

The final answer is $\boxed{\text{15 days}}$.

The decimal 0.17 has two digits after the decimal point, so it can be written as a fraction with a denominator of $10^2 = 100$.

The fraction $\frac{17}{100}$ cannot be simplified further because 17 is a prime number and 100 is not a multiple of 17.
The final answer is $\boxed{\frac{17}{100}}$.

3 zimekamilika, zimebaki 2 leo. Unapiga hatua.