Daranee bought a mango and an orange cost $4.20 at supermarket in Singapore . She paid $16.20 for 3 mangoes and 7 oranges.
Mrs.Dang bought 6 Kg of beef and 2 kg of pork, and Mrs. Lina bought 6 kg of pork and 2 kg of beef. Mrs. Dang paid 195 Bath more than Mrs.Lina.lf 1 kg of pork cost 80 Bath,Find the cost of a kilogram of beef