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1 x 20 = 20
2 x 45 = 90
3 x 10 = 30
4 x 25 = 100

Number of bookmarks made altogether = 20 + 90 + 30 + 100 = 240

0 Replies 1 Like ✔Accepted Answer

The number of bookmarks owned by each student not all equal to 1, some owned 2 , 3 or 4 bookmarks and some owned nothing.

So you have to multiply the number of bookmarks owned by each student and summed it up to get the total bookmarks number.

Total bookmarks = 0 * 10 + 1* 20 + 2 * 45 + 3 * 10 + 4 * 25 = 240

0 Replies 1 Like