Question

Out of $13$ paintbrushes, $9$ are worn-out and need to be replaced. How many are in good condition?
Identify the set of addition and subtraction equations that represent the problem.

• A. $22;13+9=22,22–9=13$
• B. $3;9+3=1313–9=3$
• C. $6;6+7=13,13–7=6$
• D. $4;9+4=13,13–9=4$

Answer 1

The correct option is D $4;9+4=13,13–9=4$

Total number of paint brushes $=13$
Number of worn out paint brushes $=9$
Here, we need to find the number of paint brushes in good condition.
As per the given information, both the addition and subtraction equations must have both the numbers $9$ and $13$.
Therefore, the equations that can be framed are $9+?=13$ and $13–9=?$



Hence, Option D is correct, $4$ paint brushes are in good condition, and the correct equations are $9+4=13$ and $13–9=4$.