Question

Shaman has 215 photos on his cell phone he deletes some so that only 129 photos remain what is the percent decrease in the number of photos

Answer 1

First find how many were deleted, by subtracting the remaining amount from the original amount:

215 - 129 = 86 pictures deleted.

Now divide the amount deleted by the original amount:

86 / 215 = 0.4

Multiply by 100:

0.4 x 100 = 40%

There was a 40% decrease.