If the number a is divided by 9, the quotient 12 is more than 7; if the number B is divided by 9, the quotient 28 is more than 6; if the number C is divided by 9, the quotient 3 is more than 5?

If the number a is divided by 9, the quotient 12 is more than 7; if the number B is divided by 9, the quotient 28 is more than 6; if the number C is divided by 9, the quotient 3 is more than 5?

Hello
Because in "(number a + number B + number C) △ 9", after removing the multiple of 9 mentioned above, as long as the sum of the remainder can form a team, there is no remainder of 9, because 7 + 6 + 5 = 18, which is a multiple of 9, so there is no remainder
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Primary school mathematics: the divisor divided by the divisor, the quotient is 47, the remainder is 3. The divisor, the divisor, the quotient and the sum of the remainder is 629. How much is the divisor?
No equations. I didn't learn equations in primary school
I find that your idea is still the equation. Can we not use equation thinking, that is, not assuming that divisor is an unknown number, but only use addition, subtraction, multiplication and division to deduce the result?

Because the sum of divisor, divisor and quotient residue is 629,
So the sum of divisor and divisor = 629-3-47 = 579
And because the divisor △ divisor = quotient + remainder, that is to say, the divisor is quotient
That is (47 divisor + 3) + divisor = 579
Or 48 divisors + 3 = 579
So divisor = (579-3) △ 48 = 576 △ 48 = 12

Three eighths of a number is a quarter more than 25 percent of the number. Find the number. (use equation solution)

Let this number be X
3/8x-25%x=1/4
(3/8-2/5)x=1/4
-1/40x=1/4
x=-1/4÷1/40
x=-10
If you don't understand, please ask

Seven eighths of a number is 3.75 more than 40%. What's the number? (solve the equation)

Let this number be X
7/8x-40%x=3.75
7/8x-2/5x=3.75
19/40x=3.75
x=150/19

How to solve the equation 6.2x-19.16 = 41.6

6.2X=41.6+19.16
6.2X=60.76
X=60.76/6.2
X=9.8

How to solve the equation of 0.25x + 0.2x (1-0.25) = X-6

0.25x+0.15x=x-6
-0.6x=-6
x=10

How to solve 5 + (2x + 1500 / 3 = x equation?

Original formula: 5 + 2x + 500 = x
2x-x=-505
x=-252.5

The solution of 4x-3y = 145 x + 3Y = 31 by the method of addition, subtraction and elimination

4x—3y=14
X = (14 + 3Y) / 4 into 5x + 3Y = 31
(14+3y)/4+3y=31
14+3y+12y=124
15y=110
y=22/3
x=(14+3y)/4=9

18x + 8 = 20x + 4 [solution of equation]

18x+8=20x+4
18x-20x=4-8
-2x=-4
x=2

How to solve this equation (0.18x) + (2200-x) * 0.18
I made a mistake. It's like this. How to solve this equation (0.18x) + (2200-x) * 0.18 = 131

If you calculate the left side, you get 0.045x + 297 = 131
045 = - 166
That is, x = (- 33200 / 9)