### [GCSE ‘O’ Level Year 11 Math: Inequalities] Abigail is 5 years older than Brenda.Brenda is twice as old as Carly. The total of their ages is less than 40 What is Abigailâ€™s greatest possible age?

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I got 17, but the answer is 18, it would be great if you could explain how its 18

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