Question

12 : x = 16 : 8
X x 10 = 80:2
X + X =245+X

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Answer 1

12 : x = 16 : 8

12 : x = 2

x = 12 : 2

x = 6

Verific:     12 : 6 = 2

___________________

X × 10 = 80 : 2

X × 10 = 40

X = 40 : 10

X = 4

V:   4 × 10 = 80 : 2

____________________

x + x = 245 + x

2 x - x = 245

x = 245

Verific:   245 + 245 = 245 + 245 ( corect )

Answer 2

12÷x=16÷8
12÷x=2
x=12÷2
x=6

X×10=80÷2
X×10=40
X=40÷10
X=4

X+X=245+X
2X-X=245
1X=245
X=245÷1
X=245