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(x - 2)*9 = (x - 4)*10
X = 22

D = 20 * 9 * 5/18 = 50

31 explin

4a + 5b = 100)
      a - b = 16)*4

4a + 5b = 100
4a - 4b = 64

  9b = 36
    B = 4


4a + (5*4) = 100
a = 20

a³ + b³ = 20³ + 4³
=  8064

20 %= 5 : 6

1 = 240
6 = 1440

A.     B.       C
8.    12.     16
--------48--------
6.      4.       3

A = 6 * 2 = 12
B = 4 * 3 = 12

48 - ( 12 + 12) = 24

C => 24/3 = 8days

(15m + 20k)5 = (18m + 31k)4
M : k
8 : 1

(15*8 + (20*1)*5/(9*8+28*1) = 140*5/100
= 7day

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A : s
3 : 1)1
2 : 1)2

3 : 1
4 : 2
1 = 3
3 = 9 + 3 = 12

Explain...

12.5 % = 1/8

22800*9/8 = 25650)
(25650- 8650 = 17000)

17000* 9/8 = 19125
(19125 - 9125 = 10000)

10000 * 9/8 => 11250

(x + x)2 + 76= (2x + 4x)
4x + 76 = 6x
X = 38

5500 = n/2(250×2 +( n -1)×50)
N = 11

S : m : R
11 : 10
        9 : 10
----------------
99 : 90 : 100 = 289

5780/289 = 20

R = 20 × 100 => 2000