Question

valoarea raportului nr x si y este egala cu 0,75
Aflati cate procente reprezinta nr x din y
Determinati nr x si y stiind ca suma lor este egala cu 49

Answer 1

x/y=75/100=3/4=>x=3y/4
x+y=49
3y/4+y=49
3y+4y=49x4
7y=49x4
y=28
x=21
28---------100%
21---------?
21x100/28=2100/28=75%

Answer 2

x/y=0,75
x=0,75*x
x..........100
0.75 *x......a%
x=0,75*x*100/x=75%

x/y=0,75=75/100=3/4
x/(x+y)=3/(3+4)
x/49=3/7
x=49*3/7=21
y=49-21=28