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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

What is full of holes but still holds water?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

Solve below rebus puzzle?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Count the number of triangles in the given picture.