Multiple choice general knowledge math & puzzles

3.If 10 be added to 4 times a certain number, the result in 5 less than five times the number . The number is ????

  1. 15

  2. -14

  3. 11

  4. -15

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let the number be x. According to the problem: 4x + 10 = 5x - 5. Solving: 10 + 5 = 5x - 4x, so 15 = x. Therefore the number is 15. Option A is correct.

AI explanation

Setting up the equation: 4x + 10 = 5x - 5. Solving gives x = 15, which checks out since 4(15)+10=70 and 5(15)-5=70.