A pile of coal weighs 4 tons. It takes 15 tons, and there is still a lot left______ Tons. If you take another 15 tons, there's still left______ Tons

A pile of coal weighs 4 tons. It takes 15 tons, and there is still a lot left______ Tons. If you take another 15 tons, there's still left______ Tons


4 × (1-15), = 4 × 45, = 165 (tons); 165 × (1-15), = 165 × 45, = 6425 (tons); answer: use 15, there are 165 tons left, if you use 15 again, there are 645 tons left



It's not four fifths of a meal. It's one twentieth of his meal. How much is it,


4t/5×1/20
=4t/（5×20）
=4t/（5×4×5）
=1t/25

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