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There are 54 students in class 6 (1) of a school, including 27 boys. What is the percentage of boys in the class? What is the percentage of girls?
54-27=27
Male: 27 divided by 54=
Female: 27 divided by 54=
Just figure it out
There are 54% boys in class 5 (1) and 50 students in the class. How many girls are there? How many boys are there? What percentage of boys are girls?
Write the formula.
Number of female students: 50 × (1-54%) = 23
Number of male students: 50 × 54% = 27
The percentage of female students in male students: 23 △ 27 ≈ 0.852 = 85.2%
There are 27 boys in class 61, accounting for 54% of the class. In the new semester, there are two boys and one girl. At this time, how many% of the class are boys
There are 400 literature and art books in the school library. The number of literature and art books is 80% of that of science and technology books. The number of story books is 25% less than that of science and technology books. How many of these three books are there in the library?
A barrel of oil was poured out 37.5% in the first time and 40% in the second time. A total of 31 kg was poured out in the two times. How many kg was the original barrel of oil?
(1) A: first, find out the total number of non transferred students: 27 ／ 54% = 50 (people). In the new semester, the number of boys is 27 + 2 = 29, and the total number is 50 + 2 + 1 = 53. At this time, the number of boys accounts for about 29 ／ 53 ≈ 55% (2) a: the number of science and technology books is 400 ／ 80% = 500, and the number of story books is 500 × (1-25%) = 375
A project is scheduled to be completed in 30 days. 18 people work first, and one third of the project is completed in 12 days. How many people need to be added to complete the task on time? (assuming that everyone's work efficiency is the same)
Can only use one variable equation to solve, 55 ~ my equation is the worst
We need to add x people
1÷[(1/3×1/12×1/18）×（18+x）〕=30-12
x=18
A: 18 more people are needed
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