The only way to get 3 as an answer to (6-m) is if m were to equal 3. Think about how many numbers can you replace m with to make the statement true. For example, try putting 1 as your m and see if it works. 6-1=3 -> 5=3. as you can see, this statement isnt true. The only solution that would work to make this statement true is one number, 3. Hope this helps.
Let the number of cards in each group be 2x and 3x. So, 2x + 3x = 120 5x = 120 x = 120 / 5 x = 24 Number of cards in each group is 2x = 2 × 24 = 48 3x = 3 × 24 = 72
