The average of 4 numbers is 55. Three of the numbers are 0, 25 and 15.
What is the 4th number? Ans: ___

It won't just hand you the answer — it asks where you're stuck.How the checker works

Worked solution

1. Calculate the total sum of the 4 numbers

$\text{Total sum} = 4 \times 55 = 220$

2. Calculate the sum of the three given numbers

$\text{Sum of given numbers} = 0 + 25 + 15 = 40$

3. Find the 4th number by subtracting the sum of the three numbers from the total sum

$\text{4th number} = 220 - 40 = 180$

Answer

$180$

AI analysis — may contain mistakes.

Worked this one out on paper? Snap your steps and Gigle's AI math checker will circle the step where it went wrong.