a) 25X/100 = 70
X/4 = 70
X = 70×4
X = 280
b) 25X/100 = 25
X/4 = 25
X = 25×4
X = 100
c) 25X/100 = 3/4
X/4 = 3/4
X = 4×3/4
X = 3
d) 25X/100 = 325
X/4 = 325
X = 325×4
X = 1 300
e) 25X/100 = 2 intregi 1/2
X/4 = (2×2+1)/2
X/4 = 5/2
X = 4×5/2
X = 20/2
X = 10
f) 25X/100 = 3 intregi 3/8
X/4 = (3×8+3)/8
X/4 = 27/8
X = 27×4/8
X = 27/2