Mathematics

Question

A city has 3 new houses for every 7 old houses. If there are 21 new houses in the city, how many old houses are there
A. 49
B. 47
C. 52
D. 51

1 Answer

  • Answer:

    A. 49

    Step-by-step explanation:

    ratio of houses is 3 new to 7 old

    21 new is 7 times more than 3, so 7 will also be 7 times more

    so, 21 to 49

    I hope that made sense

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