1) A highway maintenance team has built a highway with a length of 1250 meters, which has been built for 20 days, with an average of 50 meters per day. The rest of the plans will be completed in 10 days, with an average of how many meters a day? (1250-20 * 50)/10 = 252) Xiaoming bought five pencils and four exercise books in the shop and * * * paid 2.50 yuan. It is known that each pencil is 0. 12 yuan. How much is each exercise book? (2.5-0. 12*5)/4=4.753) The fourth-grade students in Dongfeng Primary School 125 students, and the number of fifth-grade students is six times less than that in the fourth grade. How many students are there in Grade 4 and Grade 5? 125+ 125*2-6=3694) The cement plant has to transport 42 tons of cement, 2.5 tons a day. After six days, 3 tons will be shipped in the remaining day. How many days does it take to transport the rest? (42-2.5*6)/3=95) A factory will manufacture a batch of machine tools. It is planned to produce 64 machine tools every day, which can be completed in 15 days. In fact, the task was completed three days ahead of schedule. How many more machine tools are actually produced than planned every day? 64 *15/12-64 =166) A coal mine originally planned to produce 660,000 tons of coal in the first half of the year, and actually produced 22,000 tons more per month than originally planned. According to this calculation, how many months will it take to complete the production plan for the first half of the year? 66/(66/6+2.2)=57) The garment factory used to make a 2.5-meter cloth. After adopting the new cutting method, each set of clothes saves 0. 1 meter compared with the original 120 sets of clothes. How many suits can you make now? 120*2.5/2.4= 1258) Hongshan primary school collected180kg of tree species in 15 days, and completed the task five days earlier than originally planned. How many kilograms more trees are actually collected every day than originally planned? 180/15-180/20 = 39) The bookbinding team has bound a batch of books. 750 books were bound on the first day and 800 books were bound on the second day. The next day was 20.5 yuan more than the first day. How much is the binding fee for the first day? 20.5/(800-750) * 750 = 307.510) The price of kerosene per kilogram is 3.5 yuan, and a barrel of kerosene weighs 8 kilograms. Half of the kerosene was sold, and the remaining barrel of kerosene weighed 4.5 kilograms. How much can this barrel of kerosene sell for? (8-4.5) * 2 * 3.5 = 24.5165438+(36+36+10.8)/12 = 6.912) A chemical fertilizer factory produced 97 tons of chemical fertilizer four days before a week. How many tons of chemical fertilizer does it produce every day this week? (97+26*3)/7=25