Harry buys 3 packs of ruled notepads. Each pack has same number of notepads. Stella buys 4 packs of plain notepads. Each pack has same number of notepads. If a represents the number of ruled notepads and b represents the number of plain notepads, write the expression showing the total number of notepads.

Respuesta :

irspow
n(a,b)=3a+4b

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