Question

b:9:3x 2 x 5 = 30
72:b:4x5x6=60

Answer 1

$\it b:9:3\cdot2\cdot5=30 \Rightarrow b:27\cdot10=30|_{:10} \Rightarrow b:27=3 \Rightarrow b=3\cdot27=81$

Answer 2

Explicație pas cu pas:

b:9×3×2=30:5

b:9×3×2=6

b:9×3=6:2

b:9×3=3

b:9=3:3

b:9=1

b=9×1

b=9

72:b:4×5=60:6

72:b:4×5=10

72:b:4=10:5

72:b:4=5

72:b=5×4

72:b=20

b=72:20

b=3,6