What is black when you buy it, red when you use it, and gray when you throw it away?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

How can you take 2 from 5 and leave 4?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

I got a bee but no honey.
got an eye but am still blind.
got a sea but no water.
got a tea but no coffee.
got a why but no answer.

What Am I?

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

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?