How do you go from 98 to 720 using just one letter?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

A father's child, a mother's child, yet no one's son.

Who am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

People make me, save me, change me, raise me. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?