The number of girls in class 61 is four fifths of that of boys. It is known that there are 54 students in the class. How many boys are there?

The number of girls in class 61 is four fifths of that of boys. It is known that there are 54 students in the class. How many boys are there?

4 / 5x + x = 54 9 / 5x = 54 x = 30 A: there are 30 boys

The number of boys in class 61 accounts for 54% of the class, and the number of girls is 4 less than that of boys. How many students are there in class 61?

50 people

In class 61, the number of boys accounts for three fifths of the total number of students in the class. What percentage of the total number of girls in the class? What percentage of the total number of girls in the boys?
(one decimal place shall be reserved before the incomplete percentage sign)

The number of female students in the class: (1-3 / 5) * 100% = 40%
The proportion of female students in male students: 2 / 5 / 3 / 5 * 100% = 2 / 3 * 100% = 66.7%

The number of girls in class 61 is three fifths of that of boys. How many more boys than girls? What is the ratio of girls to the whole class
What is the percentage of boys in the class?

(1 -3/5)/(3/5) = 2/3
(3/5):(1 + 3/5) = 3:8
1/(1+ 3/5) = 5/8
The number of female students in class 61 is three fifths of that of male students. The number of male students is two thirds more than that of female students. The ratio of female students to the whole class is (3:8). The number of male students accounts for five fifths of the total class
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When x ∈ [- 2,2], the inequality x2 + ax-3a is known

There are three cases of symmetry axis (1) - A / 2 ≥ 2 (2) - 2 < - A / 2 < 2)
(3) When - A / 2 ≥ 2, x = - 2 is farthest from the axis of symmetry, and the opening of the function is upward, so there is a maximum value. At this time, a ＞ 4 / 5 contradicts the assumption. When x = 0, a ＞ 0 can be known, so the second case can be reduced to 0 ＜ a ＜ 4, the same as above, and x = 2 has a maximum value. At this time, a ＞ 4 contradicts the known value. When - A / 2 ＜ - 2, the same as above, a ＞ 4 can be known
In conclusion, a > 4

The fourth power of x minus 15 times the square of x plus 10x plus 24 equals 0

x^4-15x^2+10x+24=0x^4-15x^2+44+10x-20=0(x²-11)(x²-4)+10(x-2)=0(x+2)(x-2)(x²-11)+10(x-2)=0(x-2)(x³+2x²-11x-12)=0(x-2)[x(x+1)²-12(x+1)]=0(x-2)(x+1)(x²+x-12）=0(x-2)(x+...

The fruit shop brought in a batch of fruits, and sold 60 kg on the first day, which was exactly 23 on the second day. In the two days, 14% of all the fruits were sold. How many kg of these fruits were originally sold?

(60 + 60 △ 23) △ 14 = (60 + 90) × 4 = 150 × 4 = 600 (kg). A: this batch of fruit is 600 kg

Party A and Party B cooperate to complete a batch of parts. After 1.5 hours, Party A will make 15 more parts than Party B. the work efficiency of Party A is 1.5 times that of Party B. how many parts does Party A and Party B make per hour? How to do? Thank you

Suppose B does x per hour, then a does 1.5x per hour
（1.5X-X） X 1.5=15
The solution is x = 20
B does 20 per hour, a does 30 per hour

The condition of amplitude balance for self-excited oscillation of sine wave oscillator is

1. Sine wave oscillator is a self-excited oscillation circuit which can automatically convert DC power into AC signal with a certain frequency, a certain amplitude and a certain waveform without additional signal. In order to produce stable sine wave oscillation, the circuit must meet the conditions of amplitude and phase for oscillation starting and balance

The new century primary school plans to organize 168 teachers and students to go on an outing. It is known that the rental of 45 seat buses is 620 yuan, and that of 20 seat buses is 280 yuan. Please plan for the principal
Next, what's the best way to rent a taxi

Three cars with 45 seats
Two cars with 20 seats
The total is 2420 yuan
You can find it in a list