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en los lapices se hicieron 10.8
en los cuadernos 21.6
suma: 32+10.8+21.6= 64.4
se compro 12 :
1.80 × 12 = 21.6
precio de lapiz 0.30.
se compro 3 docenas:
0.30 × 36 = 10.8
precio de resma " x".
entonses seria:
62.4 = x + 21.6 + 10.8
62.4 = x + 32.4
62.4 - 32.4 = x
30 = x
RTA :
LAS RESMAS CUESTAN : 30