How many triangles are there on the puzzle below?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What number do you get when you multiply all of the numbers on a telephone's number pad?

Through your logical capabilities, can you make 7 an even?

Can you count the number of triangles in the given picture?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?