The cost of 3 boxes of envelopes and 4 boxes of note-cards is $19.50 Two boxes of envelopes and 6 boxes of note-cards cost $23.00 . Find the cost of each box of envelopes and each box of notecards

Alayna wonders how much water it would take to fill her cup she drops her pencil in her cup and notices that it just fits diagonal the pencil is 17 cm long and the cup is 15 cm tall how much water can the cup hold