its obvious u'll need 4 - J K ff.
now the connections will be little bit similar like normal counter.
what u'll have to do here is make the truth table for each j k ff
which takes into account the previous and next state of
the flip flops depending on which u'll get 4 k map to solve.
thus u'll get the required inputs for the j k inputs of each ff.
one more thing for j k ff and s r ff as well as t and d ff
there is a truth table that tells abt the input needed for a certain change of o/p frm previous state to next state.
your problem needs this information,it can be found in any good book i believe.
i can only help u this much because my knowledge of electronics is rusty
also a good book on k map will have a similar problem solved in it,
try referring to it.
if u read my other posts u'll see similar answers
which only implies that k map and Quinn McCluskey methods shud be learned by everyone
who pursues electronics it makes life lot easier.