the weight of an object changed by =25.0% the object's final weight was 2.5 grams. What is it's inital weight
X grams = The weight.
If the change was -25%:
W = X - 0.25X = 2.5g.
X - 0.25X = 2.5,
0.75X = 2.5,
X = 3.3333g = Initial Wt.
If the change was 25%:
W = X + 0.25X = 2.5g.
X + 0.25X = 2.5,
1.25X = 2.5,
X = 2g. = Initial Wt.