How many pencils do all the kids in total have?
We already know that a single image of a pencil represents 6 pencils.
Number of pencils with Sonu = 6x6 = 36
Number of pencils with Monu = 1x6 = 6
Number of pencils with Golu = 2x6 = 12
Number of pencils with Sallu = 3x6 = 18
Total number of pencils the kids have = 36 + 6 + 12 + 18 = 72