How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Count the number of triangles in the picture below:

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

why number 8549176320 is one of a kind?

The centre of the third figure is empty. What digit should fit inside?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

Why is the Hole below a Lock?