脑洞大师 第 15 关：4 + 5 x 5 - 2 = ?
脑洞大师 第 15 关
通关截图
快速答案
Solve the equation using order of operations: 5 x 5 = 25, plus 4 is 29, minus 2 is 27. Enter 27.
考察能力
分步解法
- 1) Identify the part of the equation that must be solved first, which is 5 x 5.
- 2) Calculate 5 x 5 = 25.
- 3) Add 25 + 4 = 29, then subtract 2 = 27.
- 4) Enter 27 and submit to clear the level.
提示
查看提示
Follow the rule that multiplication is solved before addition and subtraction.
为什么有效
The order of operations decides the result, so doing the multiplication first changes the outcome. Working through 5 x 5 = 25, then 25 + 4 = 29, then 29 - 2 = 27 gives the correct answer of 27.
常见问题
What is the answer to Brain Test level 15?
The answer is 27, found by multiplying first: 5 x 5 = 25, then 25 + 4 = 29, then 29 - 2 = 27.
How do I solve the math in Brain Test level 15?
Use the order of operations, so you start with the multiplication 5 x 5 = 25 before adding or subtracting.
What is the trick in Brain Test level 15?
The trap is adding from left to right; you must solve the multiplication first, otherwise you do not arrive at the correct answer of 27.
Why is the answer 27 in Brain Test level 15?
It is 27 because multiplication comes before addition, so you compute 5 x 5 = 25, add 4 for 29, then subtract 2 for 27.
Do I enter the number in Brain Test level 15?
Yes, type 27 using the keypad and submit it as the final value to solve the equation.
Is there a video walkthrough for Brain Test level 15?
Yes, the embedded video on this page runs through the order of operations step by step for Brain Test level 15.