Question

How many kg of salt at 42 p per kg must a man mix with 25 kg of salt at 24p per kg so that, he may on selling the mixture at 40 p per kg, gain 25% on the outlay? 1

Answer 1

Solution - 

Cost price of the mixture  = S.P. x 100/(100+gain %)
                                          = 40 x 100/(100+25) 
                                          = 40 x 100/125
                                          = 32 P per kg



Require Ratio: 8/10 = 4:5


Thus for every 5 kg of salt at 24P, 4 kg of salt at 42 P is used.


Required number of kgs  =25 x 4/5 = 20