Maria needs to sell at last 14 flowers and 14 toys to get $308
I will show you how it works:
x(12+10) = 300 you add 12 and 10 together
x(22) = 300 than 22 times x
22x = 300 now you divide 300 by 22, you will get 13.64, round it, 14
x = 14
Flowers : 10 times 14 = $ 140
Toys : 12 times 14 = $168 Now add them together.
Flowers and Toys = $308
So this is how you get the answer