Question 329205
4.50X+3.25(500-X)=2,090
4.50X+1,625-3.25X=2,090
1.25X=2,090-1,625
1.25X=465
X=465/1.25
X=372 ANS. FOR THE NUMBER OF CERAMIC CUPS.
500-372=128 ANS. COST OF THE NUMBER OF PLASTIC CUPS.
PROOF:
4.50*372+3.25*128=2,090
1,674+416=2,090
2,090=2,090