241. What will be the duplicate ratio of 2 : 7 ?

1. 1. 4 : 49

   
   
   

   2. 49 : 4

   
   
   

   3. 4 : 14

   
   
   

   4. 8 : 343

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Required duplicate ratio of
   2 : 7 = 2² : 7²

   Correct Option: A

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

---

242. Find the sub-duplicate ratio of 81 : 64 ?

1. 1. 8 : 9

   
   
   

   2. 4 : 9

   
   
   

   3. 9 : 8

   
   
   

   4. 7 : 8

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Required sub - duplicate ratio of 81 : 64 = √81 : √64

   Correct Option: C

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

---

---

243. Find the triplicate ratio of 7 : 5 ?

1. 1. 125 : 343

   
   
   

   2. 343 : 125

   
   
   

   3. 344 : 125

   
   
   

   4. 343 : 126

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Required triplicate ratio of 7 : 5 = 7³ : 5³

   Correct Option: B

   Required triplicate ratio of 7 : 5 = 7³ : 5³
   = 343 : 125

---

244. What will be the inverse ratio of 17 : 19 ?

1. 1. 19 : 17

   
   
   

   2. 18 : 17

   
   
   

   3. 17 : 18

   
   
   

   4. 19 : 5

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Required inverses ratio of 17 : 19 = (1/17) : (1/19)

   Correct Option: A

   Required inverses ratio of 17 : 19 = (1/17) : (1/19) = 19 : 17

---

---

245. If a : b = b : c, then ratio a⁴ : b⁴ is equal to

1. 1. ac : b²

   
   
   

   2. a² : c²

   
   
   

   3. c² : a²

   
   
   

   4. b² : ac

   
   
   

---

1. View Hint View Answer Discuss in Forum

   Given that a /b = b/c
   ⇒ b² = ac
   ∴ a⁴ : b⁴ = a⁴ : a² c² = a² : c²

   Correct Option: B

   Given that a /b = b/c
   ⇒ b² = ac
   ∴ a⁴ : b⁴ = a⁴ : a² c² = a² : c²

---