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The first volume of the fifth grade math exercise book
1, if the width is x, then 2*( 105+x)=320.

x=55

The width is 55 meters.

2. If panda toys produce X pieces, bear toys produce x-360.

x=5*(x-360),x=450,x-360=90

So panda toys produced 450 pieces and bear toys produced 90 pieces.

Suppose that two cars meet on the road after x hours.

80x+ 120x=900,x=4.5

4.5 hours later, the two cars met.