Edith had nine children at regular intervals of 15 months. If the oldest is now six times as old as the youngest, how old is the youngest child?

fionna
almost two ??/

Aniboh
@fionna how'd you get that, can you support your answer please?

roro123
the youngest child is 15 months. When the youngest child is just born, the oldest child is 75 months (5 times 15 as the youngest is 0 months). If you add 15 onto 0 and 15 onto 75, you get 15 months and 90 months. 15 times 6 is 90.

Me
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