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1. A factory plans to produce a batch of parts. It completes three seventh of the plan for the first time, one half of the plan for the second time, and 450 parts for the third time. The result is more than one fourth of the plan. How many parts are planned to produce? 2. Boys in Grade 5 account for five ninth of the total number of people in the whole year, and the ratio of boys to girls in Grade 6 is 4:5, The number of girls in the two grades is the same. How many boys are there in the two grades? 3. The number of students in the first grade of Yuhong primary school is two-thirds of the total number of students in the second and third grades, and the ratio of the number of students in the third grade to the total number of students in the first and second grades is 1:4. There are 120 students in the second grade, and how many students are there in the first and third grades?
1. Plan to produce X parts 3x / 7 + X / 2 + 450 = 5x / 4, the solution is x = 1400 2. There are x boys in Grade 5 and Y boys in Grade 6. The number of boys in Grade 5 is x / (5 / 9) = 9x / 5, and girls in Grade 5 account for 4 / 9 of the whole grade, that is, the number of girls in Grade 5 is (4 / 9) * (9x / 5) = 4x / 5
The solution of an applied problem in primary school mathematics
Xiao Li has 60 pieces of 5 yuan RMB and 2 yuan RMB. The total amount is 183 yuan. Ask him how many pieces of 5 yuan RMB and 2 yuan RMB each
Xiao Li has 60 pieces of RMB with 5 yuan face value and 2 yuan face value. The total amount is 183 yuan. Ask him how many pieces of RMB with 5 yuan face value and 2 yuan face value
Suppose 60 sheets are all 5 yuan, there should be
5 × 60 = 300 yuan
More than it is
300-183 = 117 yuan
Five yuan is more than two yuan
5-2 = 3 yuan
Two yuan is enough
117 △ 3 = 39 sheets
Five yuan is enough
60-39 = 21 sheets
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