The sum of three consecutive multiples of 5 is 285. Find the largest number.

  1. 75
  2. 100
  3. 120
  4. 90

Answer (Detailed Solution Below)

Option 2 : 100
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

Detailed Solution

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Given:

Sum of three consecutive multiples of 5 is 285

Calculation:

Three consecutive numbers are x, x + 1 and x + 2

So, Three consecutive multiples of 5 are 5x, 5(x + 1) and 5(x + 2)

The sum of three consecutive multiple of 5 is 285

∴ 5x + 5x + 5 + 5x + 10 = 285

⇒ 15x = 270

⇒ x = 18

Now, largest number = 5(x + 2) = 5 × 20 = 100

∴ The largest number is 100

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