Question

18．甲倉(cāng)存糧44.6噸、乙倉(cāng)存糧27.4噸，問(wèn)從乙倉(cāng)運(yùn)多少?lài)嵉郊讉}(cāng)才能使甲倉(cāng)是乙倉(cāng)的4倍？

Answer 1

分析 甲倉(cāng)存糧44.6噸、乙倉(cāng)存糧27.4噸．乙倉(cāng)運(yùn)出x噸到甲倉(cāng)才能使甲倉(cāng)是乙倉(cāng)的4倍．由題意可知：（乙倉(cāng)庫(kù)的存糧-x）×4=甲倉(cāng)庫(kù)的存糧+x，據(jù)此等量關(guān)系即可列方程求解．

解答 解：設(shè)乙倉(cāng)運(yùn)出x噸到甲倉(cāng)才能使甲倉(cāng)是乙倉(cāng)的4倍．
（27.4-x）×4=44.6+x
   27.4×4-4x=44.6+x
  109.6+4x-4x=44.6+5x
           5x=65
            x=13
答：乙倉(cāng)運(yùn)出13噸到甲倉(cāng)才能使甲倉(cāng)是乙倉(cāng)的4倍．

點(diǎn)評(píng) 解答此題的關(guān)鍵是：設(shè)出未知數(shù)，找清等量關(guān)系，即可列方程求解．