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Three Questions on winter vacation homework of Mathematics in the Sixth Grade of Primary School (to be answered urgently)
1, the ratio of a to b is 5:3, the difference between the two numbers is 12, and b is (18).

2. Solve the equation: 19—20%x=7 (with flow)

0.2X= 19-7

0.2X= 12

X=60

3. Solve the equation: 4/9: 1/6 = x: 15 (with flow)

8:3=X: 15

3X=8* 15

3X= 120

X=40

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