(30+x) 10= 15x
300+ 10x= 15x
5x=300
x=60
15× 60 = 900m
A: It takes 60 minutes to climb this mountain, which is 900 meters high.
2.∫2 | x |- 1 = 0
∴2|x|= 1
∴x= 0.5
3. 1/4+5(x- 1/20 10)= 1/2
Solution:1/4+5x-1/402 =1/2.
5x=203/804
x=203/4020
3+ 10(2x- 1/ 1005)= 3+ 10(2x 203/4020- 1/ 1005)= 808/20 1
4. Solution: Assume that the remaining work will take X hours to complete.
4× 1/20+( 1/20+ 1/ 12)x = 1
1/5+2/ 15x= 1
2/ 15x=4/5
x=6
A: The rest of the work will take six hours to finish.
5. Solution: Set the scheduled time limit as X days.
20x+ 100 = 20( 1+0.2)x-50
20x+ 100=24x-50
4x= 150
x=37.5
37.5X20=750 (piece)
A: The worker originally planned to produce 750 parts, and the planned construction period was 37.5 days.
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