Maths Set Theory Puzzle

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?




Similar Riddles

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Asked by Neha on 14 May 2021


Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.


Find Bus Direction

Asked by Neha on 17 May 2021

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Asked by Neha on 29 Dec 2020


How can a man go eight days without sleep?

Asked by Neha on 11 Mar 2024

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Asked by Neha on 01 Nov 2025

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

Asked by Neha on 26 Jan 2026


I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

Asked by Neha on 30 Oct 2024

The world's largest Thanksgiving turkey was on display at a fair. Everyone was admiring it when suddenly a woman ran up and shot the turkey and left. Everyone knew her yet nobody made any attempts to stop or report her. Why?

Asked by Neha on 24 Feb 2023

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Matchsticks Equation

Asked by Neha on 19 Feb 2021


Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Missing Piece Riddle

Asked by Neha on 03 Apr 2021

Hot Articles

Amazing Facts

Challenging

There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.