12：5=[12+________]：30．
60
分析：設(shè)這個(gè)數(shù)是x，根據(jù)比例的基本性質(zhì)可得：（12+x）×5=12×30，解答即可．
解答：設(shè)這個(gè)數(shù)是x，則：
（12+x）×5=12×30，
60+5x=360，
60+5x-60=360-60，
5x=300，
x=60；
故答案為：60．
點(diǎn)評(píng)：解答此題應(yīng)根據(jù)比例的基本性質(zhì)：內(nèi)項(xiàng)之積等于外項(xiàng)之積
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