Answer:
20%
Step-by-step explanation:
Let w and l represent the original width and length. Let W and L represent the width and length of the larger tapestry. The corresponding areas are the product of length and width.
LW = 1.2·lw . . . . . the new area is 20% larger than the original
(1.5·l)W = 1.2·lw . . . the new length is 50% larger than the original
W = (1.2·lw)/(1.5·l) = 0.8·w . . . . . divide by the coefficient of W
The new width is 80% of the old width, hence the width was decreased by 20%.
