Which of the following are in proportion? (a) 2, 3, 20,30 (b) 3, 4, 15, 18 (c) 1, 3, 11, 22 (d) 2, 5, 40, 80
Answers
2,3,20,30 are in proportion.
2/3 = 20/30
2/3 = 2/3
Do mark it as Brainliest if you really found it helpful !
✌️☺️
Keep smiling !
Answer:
2 : 3 and 20 :30 are in proportion
Step-by-step explanation:
The given numbers are might be ratio as 2: 3 : : 20:30
3 :4 : : 15: 18
1 :3 : : 11 : 22
2 :5 : : 40: 80
here we need to find if given ratios are in proportion are not
If a : b and c : d are in proportion the ad = bc
1) 2 : 3 : : 20 : 30 ⇒ 2× 30 = 3× 20
⇒ 60 = 60
∴ 2 : 3 : : 20: 30 are in proportion
2) 3 : 4 : :15 : 16 ⇒ 3 ×16 = 4 ×15
⇒ 48 60
∴ 3 :4 : : 15 : 16 are not in proportion
3) 1 :3 : : 11 : 22 ⇒ 1×22 = 3 ×11
⇒ 22 33
∴ 1 :3 : : 11 : 22 are not in proportion
4) 2 : 5 : : 40 : 80 ⇒ 2×80 = 5×40
⇒ 160 200
∴ 2 : 5 : : 40 : 80 are not in proportion