Brain Test: Tricky Puzzles Level 278 Answer [What Is the Question Mark?]

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Brain Test: Tricky Puzzles Level 278 shows three triangles with numbers at the corners and a number in the middle: 8, 3, 1 give 12 and 3, 2, 1 give 6. The left triangle has 4, 5 and 10 with a question mark. Try the hints first, or jump straight to the answer below.

Just want a hint?

Try these two hints before you look at the solution. They point you in the right direction without giving the answer away.

Still stuck on Level 278? The walkthrough below shows every move, and the full answer comes right after it.

Brain Test: Tricky Puzzles Level 278 walkthrough

Close ✕

1. Add the corners. 4 + 5 + 10 = 19.
2. Type 19. Tap 1, then 9, then the green tick.

Brain Test: Tricky Puzzles Level 278 answer

The other two triangles prove the rule: the number in the middle is the total of the three corners.

What you can and can’t use

• Tap1 then 9 On the number pad.
• TapGreen tick Submits the answer.

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About Brain Test: Tricky Puzzles

Brain Test: Tricky Puzzles is a free puzzle game by Unico Studio with hundreds of trick questions. Most levels can’t be solved the obvious way: you drag objects, tap hidden spots and sometimes turn your phone to find the answer. Get it on Google Play or the App Store.

Thanks for reading! If this got you past Level 278, the next answers are linked above, and every level is on the Brain Test: Tricky Puzzles All Answers page.