For keeping fit X people believe in morning walk, Y people believe in yoga Z ppl join gym. Total no. of people are 70. Further 20% 30% 40% ppl are suffering from any disease who believe in morning walk,yoga gym. Total no of such ppl is 21. If morning walk costs Rs.0, yoga Rs500 per month gym Rs400 total expenditure is Rs23000. Formulate a matrix problem calculate the no of each type of ppl.