1.02-0.12 =1(ton)
300× 1.02=306 (ton)
306 ÷ 1 = 306 (Taiwan Province)
Xiaoming bought six pencils and four exercise books, each of which cost 0.68 yuan, and each pencil cost 0.24 yuan. Xiao Ming paid 5 yuan money, how much should he get back?
0.68×4=2.72 (yuan)
0.24× 6 = 1.44 (yuan)
2.72+ 1.44=4. 16 (yuan)
5-4. 16=0.84 (yuan)
3. Two trains, A and B, leave from two places at the same time. The speed of train A is 80 kilometers per hour, and that of train B is 70 kilometers per hour. 12 hours later, the distance between the two trains is still 1 10 km. How many kilometers are there between these two places?
(80+70)× 12= 1800 (km)
1800+110 =1910 (km)
4. Guangming Paper Mill produced a batch of newsprint, which was originally planned to be completed in 28 days, with a daily output of 12.5 tons. Now it's finished three days ahead of schedule. How many tons are actually produced every day than originally planned?
28× 12.5 = 350 (ton)
28 3 = 25 days
350÷25= 14 (ton)
14-12.5 =1.5 (ton)
5. Li Shifu has produced a batch of parts. Three days ago, 126 parts were produced. According to this calculation, it takes 12 days to complete the production task. How many parts are there in this batch?
126 ÷ 3 = 42 (pieces)
42× (12+3) = 630 (pieces)
The chemical fertilizer plant planned to produce 84 tons of chemical fertilizer in 30 days, but actually produced 0.2 tons more than planned every day. How many days did it actually finish the task ahead of schedule?
84÷30=2.8 (ton)
2.8+0.2=3 (ton)
84÷3=28 (days)
30-28=2 (days)
7, processing a batch of clothes, processing 300 sets a day, 16 days can be completed,
(1) If 400 sets are processed every day, how many days will it be completed in advance?
300× 16 = 4800 (set)
4800 ÷ 400 = 12 (days)
16- 12=4 (days)
(2) If 20 sets are processed every day, how many days can it be completed?
300+20=320 (set)
4800÷320= 15 (days)
(3) If it is to be completed five days in advance, how many sets will be processed every day?
16-5= 1 1 (days)
4800÷ 1 1 is approximately equal to 436 (sets).
I'll tell you the rest in a few hours. I am in a hurry now.