I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What has 13 hearts but no other organs?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What type of tree can I carry in my hand?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

What has one letter and starts with an E?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?