Question

sa se afle un numar stiind ca daca din 75% din el scădem 0,625 ,obținem 3 supra 8

Answer 1

$\frac{75}{100} *a - \frac{625}{1000} = \frac{3}{8} \\ \\ \frac{3a}{4} - \frac{5}{8} = \frac{3}{8} \\ \\ \frac{6a}{8} - \frac{5}{8} = \frac{3}{8} =\ \textgreater \ 6a-5=3 =\ \textgreater \ 6a=8 =\ \textgreater \ a=1,(3)$

Answer 2

75% din  a = 75a/100 = 3a/4 
625/1000 =5/8

3a/4 - 5/8 = 3/8  /x8
6a - 5 = 3 
6a = 3 + 5 
6a = 8
a = 8/6 
a = 4/3