Question

A group of friends share cost of their party. If each pays $42, there is surplus of $19.

Answer 1

61+48=109 but that's the cost for both questions but I think its right yw hope that helped :)

42+19=61

40+8=48

Answer 2

If each person pays $2 more and then the difference is 27, then the number of people is 13.5! (Weird I know)
13.5 x 42 = 567
13.5 x 40 = 540

567-19 = 548
540+8 = 548

Therefore the price is $548