Question

(b) 3,7.5, 2,7
(a) 30 litres : 50 litres and 21 km: 35 km
7. If a: b=3:4 and b:c= 12: 18, find a : c.
8. Find the mean proportional for the
(b) 7 hours: 4 hours and 219
6. Determine if the given ratios form a proportion.​

Answer 1

Answer:

7th ans:

Here Common is b.

b is 4 and b is 12 . so LCM of 4 and 12 = 12

let's change the value of b in 1st to 12.

therefore, a: b= 3*3: 4*3= 9:12

now b is 1st and 2nd are equal which is 12.

a:b:c= 9: 12: 18

a: c= 9: 18= 1: 2(ans)