If p is the third proportional to 8, 20 and q is the fourth proportional to 3, 5, 24, then find the value of (2p + q).

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SSC CGL 2021 Tier-I (Held On : 11 April 2022 Shift 3)
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  1. 126
  2. 104
  3. 140
  4. 90

Answer (Detailed Solution Below)

Option 3 : 140
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Detailed Solution

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Given:

p is the third proportional to 8, 20

q is the fourth proportional to 3, 5, 24

Concept used:

If x is the third proportional to a, b then x = b2/a

If x is the fourth proportional to a, b, c then a/b = c/x

Calculation:

Here, p = 202/8 = 400/8 = 50

Also, 3/5 = 24/q

⇒ q = (5 × 24)/3 = 40

Then, (2p + q) = (2 × 50) + 40 = 100 + 40 = 140

∴ The value of (2p + q) is 140

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