Question
Shannon, Xuan, Vaidev and Elyse shared some pens. Shannon and Xuan took 13 of the total number of pens while Vaidev and Elyse took the rest. Xuan had twice as many pens as Shannon and Elyse had 40 pens. Given that Elyse had twice as many pens as Xuan, how many pens were there altogether?
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Shannon, Xuan, Vaidev and Elyse shared some pens. Shannon and Xuan took 13 of the total number of pens while Vaidev and Elyse took the rest. Xuan had twice as many pens as Shannon and Elyse had 40 pens. Given that Elyse had twice as many pens as Xuan, how many pens were there altogether?