Question

x:30=7 420:x=60 7*y=490 y*8=432 z+250=900 825-z=600

Answer 1

x : 30 = 7
x = 30×7
x = 210

420 : x = 60
x = 420 : 60
x = 7

7 × y = 490
y = 490 : 7
y = 70

y × 8 = 432
y = 432 : 8
y = 54

z + 250 = 900
z = 900 - 250
z = 650

825 - z = 600
z = 825 - 600
z = 225

Answer 2

1)
x:30=7 => x=30×7 => x=210

2)
420:x=60 => x=420:60 => x=7

3)
7×y=490 => y=490:7 => y=70

4)
y×8=432 => y=432:8 => y=54

5)
z+250=900 => z=900-250 => z=650

6)
825-z=600 => z=825-600 => z=225

Succes! :]