The overlapping part is three fifths of the large greeting card and three fourths of the small greeting card, all of which are three copies, indicating that each copy is equal, the non-overlapping part of the large greeting card is two fifths, (2) the non-overlapping part of the small plus card is one quarter, and (1) 270 is exactly three copies, so:

270÷3=90 90×3=270

It can also be 270 ÷ 3 = 90 90 ÷1/4 = 360 360 * 3/4 = 270.

90÷ one fifth =450 450* three fifths =270