SSC MTS 6 Aug 2019 Shift 2 Paper

460 – 26 = 434
491 – 26 = 465
553 – 26 = 527
Now, the factors of 434, 465 and 527,
⇒ 434 = 2 × 7 × 31
⇒ 465 = 3 × 5 × 31
⇒ 527 = 17 × 31
∴ HCF of 434, 465 and 527 is 31.
∴ 31 is the required number.