Repairing a section of road, 45% of the total length was repaired on the first day, and two-fifths of the total length was repaired on the second day.

In two days, 1 built 5 10 meters. How long is this road? Solve by equation

Solution: The total length of the road is x meters.

45%X+5 2X=5 10

0.85X=5 10

X=5 10÷0.85

X=600

The first day was built 30 meters more than the second day. How long is this road? Solve by equation

Solution: The total length of the road is x meters.

45%X-5 2X=30

0.05X=30

X=30÷0.05

X=600

There are still 90 meters to repair. How long is this road? Solve by equation

Solution: The total length of the road is x meters.

X-45%X-5 2X=90

0. 15X=90

X=90÷0. 15

X=600