6 cans would be worth $15.
1. Set up problem as 2 fractions
Numerator: Number of Cans
Denominator: Price
4/10 ; 6/x
*use variable (x) to represent the cost of 6 cans which you don’t know yet.
2. Then set the 2 fractions equal to each other and cross multiply.
4/10 = 6/x
4x = 6(10)
4x = 60
x = 15
Which is how you get $15