The strength of a school is 840. The ratio of the number of students talking English to the number of students not talking English is 4 : 3. How many of the students take English?

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

Let the heights of the cylinder and cone be h and H respectively.
? ?r²h = ?r²H / 3
? h/H = 1/3
? h : H = 1 : 3.
So their heights are in the ratio 1 : 3.

If material cost Rs. 3, the cost of the article is = Rs. ( 3 + 4 + 1) = Rs. 8
If material cost Rs. 67.50, the cost of the article = Rs. (8/3 x 67.5) = Rs. 180

Ratio of time taken = 1/3 : 1/4 : 1/5 = 20 : 15 : 12

A : (B + C) = 2 : 9
? A's share = Rs. (385 x 2/11) = Rs. 70

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

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

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

Ratio of shares of A, B and C = Ratio of their investments
= 28000 : 35000 : 14000 = 4 : 5 : 2
? A's share = (4/11) x 5225 = ? 1900

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