Math problem. Multiple Choice.?

4 years after Jumbo the elephant was born, Gumbo was born. 4 years later, Mumbo was born. Now, Jumbo is 5 times as old as Mumbo. How old is Mumbo?

a) 2

b) 4

c) 6

d) 8

e) 10

3 Answers

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  • 8 months ago

    4 years after Jumbo the elephant was born, Gumbo was born.

    4 years later, Mumbo was born. 

    J + 4 = G, G + 4 = M  

    J + 8 = M

    Now, Jumbo is 5 times as old as Mumbo.

    J = 5M

    If M = 2, J = 10

    Answer choice: 

    a) 2  

  • 8 months ago

    if the math is too confusing for you, and the problem IS multiple choice, just try each answer.

    If Mumbo is 2, and Jumbo is 5 times as old, then Jumbo would be 5X2=10.

    That works correctly, because then Gumbo would be 10-4=6.

    So you have all 3 ages working with the given conditions:

    Jumbo = 10

    Gumbo = 6

    Mumbo = 2

    each 4 years apart and Jumbo is 5 times as old as Mumbo.

    So, YES, answer a) 2.

  • 8 months ago

    4 years after Jumbo the elephant was born, Gumbo was born

    j = g + 4

    4 years later, Mumbo was born.

    g = m + 4 

    In j = g + 4 Substitute for g = m + 4

    j = (m + 4) + 4

    j = m + 8

    Now, Jumbo is 5 times as old as Mumbo

    j = 5m

    Set the last two equations equal

    5m = m + 8

    4m = 8

    m = 2 <–––––– answer a

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