A, B and C started a business by investing ? 28000, ? 35000 and ? 14000, respectively, At the end of a year, they got a total profit of ? 5225. Find A's share?

A : B = 5 : 2 = 5/2 : 1, B : C = 7 : 13 = 1 : 13/7
A : B : C = 5/2 : 1 : 13/7 = 35 : 14 : 26
? A's part = 750 x 35/75 = ? 350

Let 5A = 12B = 6C = k
Then, A = k/5, B = k/12 and C = k/6
? A : B : C = k/5 : k/12 : k/6 = 12 : 5 : 10

Let the number of 25 paise, 10 paise and 5 paise coins be N, 2N and 3N, respectively. Then ,
N + 2N + 3N = 60
? N = 10
? The number of 5 paise coins = 3 x 10 = 30

The number of students talking English = 4/(4 + 3) x 840 = 480

Of every 4 employees, 1 is college graduate and 3 are not college graduates.
? The required ration = 1 : 3

Ratio of share of A, B and C = Ratio of their investments
= 45000 : 55000 : 60000 = 9 : 11 : 12
A's share = (9/32) x 11200 = ? 3150
B's share = (11/32) x 11200 = ? 3850
? B's share more than A = ( 3850 - 3150) = ? 700

Given 2A = 3B = 4C
Now 2A = 3B
? A/B = 3/2
or A : B = 3 : 2 = (3 x 2) : (2 : 2) = 6 : 4

Again 3B = 4C
? B/C = 4/3
or B : C = 4 : 3

? A : B : C = 6 : 4 : 3

Lat the 4th proportional = N
Then, 4 : 16 : : 7 : N
? 4/16 = 7/N
? 4N = 7 x 16
? N = (7 x 16)/4 = 7 x 4 = 28

Required duplicate ratio of
2 : 7 = 2² : 7² = 4 : 49

Required sub - duplicate ratio of 81 : 64 = ?81 : ?64 = 9 : 8