Tierra stamp in the beginning is 84 stamp.
How to find the number of stamp ?
Tierra and Joey shared some stamps in the ratio 7:5.
Tierra gave Joey 12 stamps.
Each of them had the same number of stamps in the end.
Let represent the equations.
x = the initial total amount of stamp
Tierra stamp = 7 / 12 x
Joey stamp = 5 / 12 x
Tierra gave Joey 12 stamps.
Therefore,
7 / 12 x - 12 = 5 / 12 x + 12
7 / 12 x - 5 / 12 x = 12 + 12
7x - 5x / 12 = 24
2x / 12 = 24
cross multiply
2x = 24 × 12
2x = 288
x = 288 / 2
x = 144
Tierra stamp in the beginning = 7 / 12 (144) = 84
Therefore, Tierra stamp in the beginning is 84 stamp.
learn more on ratio here: https://brainly.com/question/24290739
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