Find A Double Digit Number Whose Sum Is 4 And When The Digits Are Doubled Their Product Is 16.
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Answer:
22
Step-by-step explanation:
let the number be ab
a+b=4
2a*2b=16
4ab=16
ab=4
b=4/a
a+4/a=4
a²-4a+4=0
a=2 and 2
b=4/2=2
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