How many 9’s are there preceded by 3 in the given sequence? 

896739378394563969

In a certain code SISTER is 535301, UNCLE as 84670, and BOY as 129, how is SON coded?

If in a certain code EXIST is coded as ESIXT, how is PLUTO coded in the same language?

A doctor gives Rema five tablets asking her to take each one after half an hour. How long will she take to finish all the tablets?

What should be number in the place of the hyphen

 (a) 12, 24, (‐), 96

If ARID = 32 then DEAR = ?