M : w
9 : 5)7 =63 : 35
7 : 6 )9 =63 : 54
19==19
63+35=98==98
Initial =98+84=182✔

Total=29*68=1972
Top 3's=1972-26*65.5
=269

2nd high =84
3rd high=83
High=269-84-83=102 minimum✔

100x*144/100 =144x

P : A=100x : 144x
R=20%
Int=1240*44%=545.6 ✔

How to solve by ratio concept

Let income
A= 6x
B= 5x
6x-12000 3
----------------=
5x-18000 2

12x-24000= 15x-54000
3x= 30000
X= 10,000
A= 10000*6= 60,000

××6 : 5
3 : 2
_______
3==30000
1==10000
6==60000✔

2 1
5 3
———-
4k 1k

1 == 7k
2 == 14k

Or

(2x - 4000)/(x - 1000) = 5/3 (Solve)

Can someone ans ques no 13 ?

5x+4y = (6x+8y)2/3
15x+12y = 12x+16y
x:y = 4:3

Explain

2.5:1= 5:2
3 == 50
5 == 250/3
2 == 100/3

250/3 -- 6
500
100/3 -- 15

Tym = 500/21= 23(17/21) days

465=15000*R^2(300+R)/1000000

31000=R^2(300+R)
R=10%

Int=15000*33.1%=4965 ✔

Explain plzz

X(1-80/x )^2 =256

(x-80)^2=256x

X^2-416x+6400=0
X=800/2 ,32/2 =400,16
16 is not possible
So x=400 ✔

Solution ?

3==45000
5==75000

5==25000
14==70000

Total savings =75000-70000=5000✔