Vu Solve these number riddles. (a) • I have four digits. Tam more than 2500. • I am less than 3000 • My hundreds digit is 6. My tens digit is one less than my hundreds digit. • My units digit is 0. What number am I? (b) • I have four digits • My units digit and my hundreds digit are the same. • Tam less than 9000. • I am greater than 8000. • My tens digit is 4. • My hundreds digit is two more than my tens digit. What number am I?