Danny made a mistake in the following problem. Each line shows the steps Danny took in order to solve the problem.
The mistake was made in Line ___. Only input the number of the first incorrect line.
Line 1
21 + 35 ÷ 7 + 6(2)
Line 2
21 + 5 + 6(2)
Line 3
21 + 11(2)
Line 4
21 + 22
Line 5
43
No idea at all?
Multiplication comes before addition. Where is that rule violated?
The mistake was made in Line 3.
To find the line in which Danny made a mistake, we need to go through the steps he took to solve the problem and identify the incorrect line.
In this case, Danny made a mistake in Line 3.
To explain how to find the mistake, let's go through the steps one by one:
Line 1: 21 + 35 ÷ 7 + 6(2)
Here, Danny correctly identifies the division operation (÷) and the multiplication operation (6(2)).
Line 2: 21 + 5 + 6(2)
In this line, Danny correctly simplifies the division operation by dividing 35 by 7, which equals 5.
Line 3: 21 + 11(2)
Here is where Danny made a mistake. Instead of correctly multiplying 6 by 2, he mistakenly multiplies 11 by 2.
Line 4: 21 + 22
Danny correctly calculates the result of multiplying 6 by 2, which equals 12.
Line 5: 43
Finally, Danny adds 21 and 22 correctly, resulting in the final answer of 43.
Therefore, the mistake was made in Line 3.