Math questions for the world's smartest teens

Rack your brains and solve these challenging Mathematics questions that have been tried and tested by the world's sharpest teenagers!

Question 1

15-year-old Phoebe Cai solved this dominoes question.

12-year-old Dylan Toh solved this question.

17-year-old Tadewos Abiye Getachew had the answer to this qestion.

16-year-old Inderjit Kaur solved this question.

15-year-old Nur Muhammad Shafiullah got this sum right.

15-year-old Raghav Sood had the correct answer to this question.

12-year-old Farrell Wu solved this question.