Question 455121
John's brothers age is ten years less than twice john's age. 

If john is 25 then how old is his brother?
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Equation:
b = 2j - 10
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j = 25
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Substitute and solve for "b":
b = 2*25-10
b = 50-10 
Brother's age = 40 yrs 
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Cheers,
Stan H.