He could use a scale to measure the weight and use pounds as the unit of measure.
Answer:
Can you type it the Photo isn't showing for me
Let the numbers be x and y, then
2x + y = 47 . . . (1)
x + 3y = 56 . . . (2)
(2) x 2 => 2x + 6y = 112 . . . (3)
(1) - (3) => -5y = -65 => y = -65/-5 = 13
From (2), x + 3(13) = 56 => x = 56 - 39 = 17
The two numbers are 13 and 17.
Let's use the variable E to represent the total value spent by Elena and T to represent the total value spent by Taniy.
If Elena spent $7.45 plus the cost of 3 pounds of cherries, the expression for the amount she spent is:

Taniy spent $3.35 plus the cost of 2 pounds of cherries, so the expression for the amount the spent is:

To find how much more Elena spent, let's subtract both expressions:

Therefore the answer is 4.1 + p.