Mathematics
Grade-7
Easy

Question

The product of two numbers is negative 20 over 9. If one of the numbers is 4, the second number is _________.

  1. negative 5 over 9
  2. 3 over 11
  3. 12 over 39
  4. negative 9 over 11

hintHint:

Assume the other number be X and then use the multiplication formula to solve the question.

The correct answer is: negative 5 over 9


    STEP BY STEP SOLUTION
    Let the first number be = X
    Second number = 4
    Product = negative 20 over 9
    Product = first number × second number
    X = negative 20 over 9 space cross times space 1 fourth space equals space fraction numerator negative 20 space cross times space 1 over denominator 9 space cross times space 4 end fraction space equals space minus 20 over 36 space equals space minus 5 over 9
    The other number = negative 5 over 9

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