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After Abby spent 5/8 of her saving, she has 3/8 left.

3/8 of Abby equals to 1/3 of Betty + $100.

3/8 of Abby also equals to 1/2 of Betty – $30.

Hence, 

1/3 of Betty + $100 = 1/2 of Betty – $30

1/2 of Betty – 1/3 of Betty = $100 + $30

1/6 of Betty  = $130

Betty = $780

1 Reply 0 Likes

It’s $30 not $50.

The answer should be $780.

1 Reply 1 Like

Hehehe, many thanks. 😀

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