Question
Sabrina, Vanessa, Archie and Opal shared some pens. Sabrina and Vanessa took 15 of the total number of pens while Archie and Opal took the rest. Vanessa had twice as many pens as Sabrina and Opal had 40 pens. Given that Opal had four times as many pens as Vanessa, how many pens were there altogether?
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Sabrina, Vanessa, Archie and Opal shared some pens. Sabrina and Vanessa took 15 of the total number of pens while Archie and Opal took the rest. Vanessa had twice as many pens as Sabrina and Opal had 40 pens. Given that Opal had four times as many pens as Vanessa, how many pens were there altogether?