What is the greatest number which on dividing 1223 and 2351 leaves remainders 90 and 85 respectively?
1133
127
42
1100
Explanation:
Required number
= HCF of $\left(1223 - 90\right)$ and $\left(2351 - 85\right)$
= HCF of 1133 and 2266
= 1133