STEP-BY-STEP SOLUTION:
Let x = cost of 15 tomatoes
6 tomatoes = $4
15 tomatoes = $x
Since the 6 from the first equation is multipled by 2.5 to obtain the 15 in the second equation, we must also do the same to the right-hand side of the equation.
This means we have to multiply 4 by 2.5 to obtain the value of x.
So:
x = 4 × 2.5
x = $10
ANSWER:
Therefore, the answer is:
The cost of 15 tomatoes is $10.
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