x = timpul alocat rezolvarii temelor
1/2*x = tema la matematica
3/4*(x-1/2x) = tema la romana
tema la romana = 3/4 * 1/2x
tema la romana = 3/8x
10 minute = x- (1/2x+3/8x)
10 min = x-(4/8x+3/8x)
10 min = x-7/8x
10 min = 1/8 x
x= 10 / 1/8
x= 10 * 8
x = 80 de minute = 1 ora si 20 de minute