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140 dm = 140 : 100 = 1,4 dam
1,5 dam + 1,4 dam = 2,9 dam
36 m = 36 : 10 = 3,6 dam
jadi tali yang belum tersedia adalah
3,6 dam - 2,9 dam = 0,7 dam (a)
semoga membantu :-)