hi Jessica,

Following pls find my worked solution:

D had 80 more stickers. Since D gave 25% (1/4) to K, we can divide the equal portion of both D and K into 4 units (u) each as shown below:

<before>

D |--|--|--|--|<- 80 ->| --> 4u + 80

K |--|--|--|--| ******* --> 4u

<process>

D gave 25% (1/4) to K.

(1/4) × (4u + 80) = 1u + 20

so ...

D = 4u + 80 - 1u - 20 = 3u + 60

K = 4u + (1u + 20) = 5u + 20

In return, K gave 60% (3/5) to D.

(3/5) × (5u + 20) = 3u + 12

so, ... { the <after> model }

D = 3u + 60 + 3u + 12 = 6u + 72

K = 5u + 20 - 3u - 12 = 2u + 8

Given D had 92 stickers more than K at the end,

D - K = 92

6u + 72 - 2u - 8 --> 92

4u --> 92 - 72 + 8 = 28

1u --> 7

D (at first) = 4u + 80

--> (4 × 7) + 80 = **108**

=================

Trust this helps.

Do let me know again if theres further clarification.

Cheers,

Edward