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Mathematics, 02.07.2019 19:00 ohhrs

Quick have 5 mins mike’s age is three years more than four times his younger brother’s age. if the sum of their ages is less than 138, then find the oldest age that mike’s brother could be. i have 4x+3< 138 but i end up with x< 33.5 the answer is 26 why is this pls and explain in detail

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