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1. How many meters per minute: 3000÷5=600 (meters)

How many minutes does 1200m take? 1200÷600=2 (minutes).

2. x+x+y =18 x+y =12 so 18+ 12=30, that is, 3 X plus 3 y.

1 x plus 1 y: 30 ÷ 3 = 10.

X is equal to: 18- 10=8.

Y is equal to: 12- 10=2.

3.(x+y)÷3 = 6(x+z)÷5 = 6(y+z)÷2 = 12。

x+y= 18 x+z=30 y+z=24

18+30+24=72, which means 2 x, 2 y, 2 z.

X+y+z equals: 72÷2=36.

X equals: 36-24= 12.

Y equals: 36-30=6.

Z equals: 36 18= 18.

4. unit price × quantity = total price ax yuan