Question

Daniel gave 4/5 of his stickers to Javier. Javier’s collection of stickers increased to 64. If Javier had 28 stickers in the beginning, how many stickers did Daniel have in the beinging?

can u please show the work and explain how u got it...so i could undersatnd thank you!!

Answer 1

Javier:
64 - 28 = 36

Daniel gave Javier 36 stickers.

Daniel:
4/5x = 36
x = 36 / (4/5)
x = 36 * (5/4)
x = 180/4
x = 45

Daniel started with 45.

Answer 2

If Daniel gives Javier 4/5 of his stickers and Javier's collection increases by 64, Daniel gave him 64 stickers.
If 4/5 of Daniel's original stickers is 64:
4/5= 64 stickers
64/4= 16 so 1/5= 16
16•5= 80 so 5/5= 80
Daniel had 80 stickers in the beginning.

Answer 3

64 - 28 = 36 sticker increase
Let d = daniel's original sticker amount
4/5 D = 36
d = 45

Answer 4

Please ignore "Um's" answer; it is incorrect. I am a professor of applied physics at MIT (Massachusetts Institute of Technology.) I often like to use this problem for my advanced students, because it offers a valuable lesson that helps them grasp the concepts of relativity, and especially derivatives. The correct answer is: d=45.