4 of 15 + x = 2 of 3

4 of 15 + x = 2 of 3

4/15+x=2/3
x=2/3-4/15
x=2/5

(2 / 15 + X-5 / 4) - 2.6 + 3 and 2 / 15 over symmetric

(2 / 15 + 5 / 4) - 2.6 = 3 and 2 / 15
2 out of 15 + x-4 out of 5-5 out of 13 = 47 out of 15 multiplied by 60 on both sides
8+60x-75-156=188
60x-223=188
60x=188+223
60x=411
X = 411 out of 60
X = 137 / 20
X = 6 and 17 / 20

4 / 15-4 / 5 + x = 1 to solve the equation

4/15-4/5+x=1
x=1-4/15+4/5
x=(1*15-4+4*3)/15
x=23/15

The company has a staff, male staff and female staff ratio is 7:5, female staff () people, male staff () people

Female: 5A / 12
Male: 7a / 12

How to use factorization to solve 6y & # 178; - 11y-7 = 0?

Good 48% excellent 32% pass 12% fail 8% there are 50 people in class 61 who have reached the standard of Physical Education

Excellent = 50 * 32% = 16
Good = 50 * 48% = 24
Fail = 50 * 8% = 4
Pass = 50 * 12% = 6
The number of people who reached the standard was 46

If real numbers x and y satisfy x2 + 4y2 = 4x, then the value range of S = x2 + Y2 is______ ．

From x2 + 4y2 = 4x, y2 = 14 (4x − x2), from y2 = 14 (4x − x2) ≥ 0, the solution is 0 ≤ x ≤ 4, substituting s = x2 + Y2, s = x2 + 14 (4x − x2) = 34x2 + x = 34 (x + 23) 2-13, X ∈ [0,4], s monotonically increases on [0,4], when x = 0, s gets the minimum value of 0; when x = 4, s gets the maximum value of 16, so the value range of S is [0,16]. So the answer is: [0,16]

The number of fifth grade students in experimental primary school is 1.2 times that of fourth grade students. If the fourth grade students transfer 20 more students, the number of students in the two grades will be the same, and the number of fourth grade students will be the same______ People

There are 100 students in grade 4, so the answer is: 100

The square root of 196 is 14?

Square root, also known as quadratic root, for non negative real number, refers to a real number whose self multiplication result is equal to (√ˉˉ), where the square root of non negative real number is called arithmetic square root. A positive number has two square roots; 0 has only one square root, which is 0 itself; negative number has no square root
The square root of 9 is ± 3
Note: sometimes we say square root refers to arithmetic square root

The ratio of a to B is 3:4, the ratio of B to C is 3:5, what is the ratio of a to B to C

A: B = 3:4 = 9:12
B: C = 3:5 = 12:20
So a: B: C = 9:12:20