Journey to grandma

Daniel traveled to grandma. He travel 100 km along. Halfway travel by train, one quarter by bus, one tenth by the bicycle and the rest travel by car. How many km travel km by car?

Result

x =  15 km

Solution:

x=100 (11/21/41/10)=15 kmx=100 \cdot \ (1-1/2-1/4-1/10)=15 \ \text{km}



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