What does this rebus puzzle means ?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

Can you count the number of quadrilaterals in the picture below?

Prove that twice of ten is the same as twice of eleven.

Take one out and scratch my head, I am now black but once was red. What am I?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?