Question

Which ratio is greater ?
(1) 3:4 or 2:3 (ii) 11:21 0r 15:28​

Answer 1

Answer:

1) lcm of 4 and 3 = 12

3*3/4*3 = 9/12

2*4/3*4 = 8/12

therefore 3/4 or 3:4 is greater than 2:3

2) lcm of 21 and 28 = 84

11*4/21*4 = 44/84

15*3/28*3 = 45/84

therefore 15/28 or 15:28 is greater than 11:21

Answer 2

Answer:

1) 3:4 ii) 15:28

Step-by-step explanation:

1) 3 2

_ _

4 3

cross multiplication (first fraction its numerator × second fraction denominator, second fraction numerator × first fraction denominator. compare these two no.s gives you result)

3×3 2×4

9 8

9 > 8 so 3/4 > 2/3

(ii) 11 : 21 15:28

11 15

__ __

21 28

cross multiplication

11 × 28 15×21

308 315

315>308 so 15:28 > 11:21