Your answer would be the 4th one : time 10%4=10/4
12/15=8/(x-4)
12(x-4)=8(12)
12x-48=96
12x=144
x=12
It helps you narrow down to a smaller answer for example there is pi, (3.14159265359) and there is more and more to that number. It is now estimated to 3.14 because it would be almost impossible to work with pi if it wasn't estimated
25-percent decrease =25-(60%×25%)
25-60%×25
(1-60%)×25=(100%-60%)×25
40%×25=40÷100×25
40×25÷100
1000÷100
10ans
