Connect four 7-decimeter bamboo poles, the overlapping part of each two is 10 cm long. How long is the bamboo pole after connecting?
10 cm = 1 decimeter
Length = 7 × 4-3 × 1 = 25 decimeters
Connect four 7-decimeter-long bamboo poles. The overlapping part of each two is 10 cm long. How long is the bamboo pole after connecting?
4x70-3x10 = 250 cm
Two bamboo poles are 10 meters long. If they are tied together, they are 19 meters long. How long are the parts tied together?
Tied together = 10 + 10-19 = 1m