Straight

I think the probability is the number of possible events divided by the number of all events. 
Man is represented as m and woman is represented as w.
All possible events are mmmm, wwww, mmmw, mmww, mwww, so 5 events can happen.

If there is at least one man in the committee, then 4 events agree here.

The probability is therefore 4/5.

$\frac{\mbox{Total number of all possible events}}{\mbox{Total number of all events}}$.

IN ADDITION.

so from the 27 pieces of candy, he must get (318 - 27=) 291 more pieces of candy.

There are not just natural numbers, but also negative numbers.

When the description is saying "are integers" then you can use for a and b natural + negative values. 

9 = 0! + 2 * 2 * 2

10 = (0! + 2)! + 2 + 2

$1+\left(\frac{1}{8}\right)+\left(\frac{1}{8}\right)^2 + \left(\frac{1}{8}\right)^3 + \dots = \displaystyle\sum_{n=1}^{\infty} 8^{1-n} = \frac{8}{7}$

I'm not sure, but there are 46 Spanish students and 51 Chinese students.

97 students speak at least one language.

27 of them are only Spanish. ONLY

Means (46 - 27 =) 19 students speak two languages (Spanish and Chinese).

But it could be more because some of the Chinese students can maybe speak two languages, there is no information about this.

x is the total of students that speak two languages.

So $19 \leq x \leq 70$ . 

318 - 27 = 291.

The answer is 291 pieces of candy.

That's wrong, Guest. The solution is

a = 1

b = 29 .

But at least you tried.

If the order will matter, then (I think) the probability would be 5/72.

If the order does not matter, then (I think) the probability would be (still) 1/72.

The answer is wrong, I see. Let me solve it again.