Sandy has 6 sheets of colored paper. She uses 4 sheets to make posters. She cuts

8

Step-by-step explanation:

From the question, we are informed that Sandy has 6 sheets of colored paper and that she uses 4 sheets to make posters. Therefore she'll have 2 sheets of coloured paper left. This is gotten by : (6 - 4) = 2 sheets.

Since each rectangle is 1/4 of a sheet of colored paper, the number of greetings card that Sandy will make will be gotten by dividing 2 by 1/4. This will be:

= 2 ÷ (1/4)

= 2 × 4

= 8

Sandy will make 8 greeting cards