answer with steps pls

Do you want us to do all seven?   I don't think so.17.   s for Sonia, m for Sam, n for Nigels = 13.2 + 1.4 mn = -10 + 2.5 mn = 12 + sFirst and third,n = 12 + (13.2 + 1.4 m)Second and that one,-10 + 2.5m = 25.2 + 1.4m1.1m = 35.2m = 35.2/1.1 m = 32Answer: 32 kg18.f - # of $500 tickets, t - $300 tickets, w  - $200 ticketst = 2fw = -60 + t500f + 300t + 200w = 48000f = t/2500(t/2) + 300t + 200(-60 + t) = 48000750t = 60000t = 80w = -60 + t = 20Answer: 2019.c + b = 171c/9 = b/9 -5c = b - 45Adding,2c + b = b + 126c = 63Answer: 63Three's my limit.