What number should come in place of the question mark below?

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 ?

The more it dries, the wetter it becomes. Can you tell what it is?

What four weights can be used to balance from 1 to 30 pounds?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Find the last number in the series below:

voN luJ yaM raM ---

Five lovely ladies(Sophia, Isabella, Madison, Emma and Olivia) planned a picnic.

They each buy one thing each for the picnic.

Sophia, Emma and Olivia got a drink : orange-Juice, apple-juice, and mango-juice.
Olivia got the drink with the same letter as the one in her first name.
Emma loves mango-juice.
The other two bring some food : chocolates and pizza.
Also Madison is allergic to cheese.

So which ladies bought what ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?