hungtistic
01.10.2019 •
Mathematics
Iwill give brainliest to whoever answers this question correctly.
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Ответ:
The answer is 22.45
Step-by-step explanation:
Ответ:
x-y=21 ⇒ x=y+21
x+13=2y
Substitute y+21 for x into the equation x+13=2y
So y+21+13=2y
Simplify 34=y
So Danielle is 34 years old. Plug y back in to the original equation
x-34=21
x=55
Tony is 55 years old