180÷ 12+ 1
= 15+ 1
= 16 lamp
Install street lamps on both sides of the 240-meter-long bridge every 20 meters. How many street lamps do you need? 26 lights, each side 13 lights.
Install street lamps on both sides of the road with the length of 1000 meters. How many street lamps do you need to install a street lamp every 8 meters (installed at both ends)? 252
For a 5-kilometer-long expressway, a pole is installed every 50 meters and a street lamp is installed every 20 meters. How many street lamps are there, including both ends? 5000÷20+ 1
=250+ 1
=25 1 lamp
A bridge with a length of 180m, with street lamps installed at both ends every 30m. How many street lamps do you need? Do you want to take 2 (180÷30+1) x2 = 7x2 =14?
Need a street lamp 14.
Install lights every 20 meters on both sides of the bridge. There are 32 street lamps at both ends. How long is this bridge? 32÷2= 16 lamps, and the number of street lamps installed on each side is obtained.
Only one side is needed to calculate the bridge length. 16 lamp, generating 16- 1 = 15 intervals. Each interval is 20 meters,
Then the bridge length: 20×15 = 300m.
This is a question of going up the stairs in the primary school Olympics.
A bridge length180m. How many lamps should be installed per 12 meter? 180/ 12+ 1= 16
Install street lamps on one side of a 300-meter-long road every 15 meters. How many street lamps need to be installed at both ends? 300÷ 15+ 1
=20+ 1
=2 1
A 5-kilometer-long expressway is equipped with a telephone pole every 50 meters and a street lamp every 20 meters. How many street lamps are installed on the telephone pole, including both ends? 5 km =5000 m
The least common multiple of 50 and 20 is 100.
5000 ÷100+1= 51(lamp)
Answer: 5 1 street lamp is installed on the telephone pole.