Mom bought 4 plates and 5 bowls, which cost 12.2 yuan. Grandma also bought the same 4 plates and 8 bowls, which cost 15.2 yuan?

Mom bought 4 plates and 5 bowls, which cost 12.2 yuan. Grandma also bought the same 4 plates and 8 bowls, which cost 15.2 yuan?

15.2-12.2 = 3 (yuan) 3 / 1 = 3 (yuan)
(12.2-5)X1
=7.2X1
=7.2 (yuan) 7.2/4 = 1.8 (yuan)
A: 1.8 yuan for a plate and 1 yuan for a bowl
It should be like this!!
\(^ o ^) / (≥ ▽≤) / ~ Lala

My mother bought 4 plates and 5 bowls and paid 21.2 yuan. My aunt also bought 4 plates and 8 bowls and paid 27.2 yuan for each

The plate is 2.8 yuan and the bowl is 2 yuan
4 plates and 5 bowls = 21.2, 4 plates and 8 bowls = 27.2, three more bowls, but more than 6 yuan, so the plate is 2 yuan; 5 bowls are 10 yuan, minus 10 yuan, then 4 plates = 11.2 yuan, so the plate is 2.8 yuan
children!
Let x yuan be a plate and Y yuan be a bowl
4x+5y=21.2
4x+8y=27.2
The solution is x = 2.8, y = 2
I forgot to compare myself with the book