We set up an equation: ?/43 -87= -75
⇒ ?/43= -75+ 87
⇒ ?/43= 12
⇒ ?= 12*43
⇒ ?= 516
The unknown number is 516~
2x-y=6 2x-y=6
x+y=36 2(36-y)-y=6
72-2y-y=6
x+y=36 72-3y=6
-y -y -72 -72
x=36-y <u>-3y=66</u>
x=36-22 -3y -3y
<em>x=14 y=22</em>
Use proportions.
214/236=x/100(100 because it's a percentage.
cross multiply:
23600=214x
solve for x:
x= 11.3(rounded)
11.3% increase