I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

I have teeth but i don't bite. Who Am I ?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

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

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

O_er_t_o_

Complete the missing letters of the given word.

Decode below rebus
D
N
A
T
S , D