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If the total sum of donations were $ 12u.

Alvin contributed $ 12u * 3/4 = $ 9u.

Betty contribute $ 3u/3 = $ u

and Charles contributed $ ( 12u – 9u – u) = $ 2u.

Given 9u – 2u = 105

7u = 105

u = 15

Betty contributed $15. 

0 Replies 2 Likes ✔Accepted Answer

The diagram describes what is given:
- Alvin is 3/4 of total donation,
- Betty is 1/3 of the remaining 1/4.
If we assign u to Betty, then 9u - 2u = 7u = 105 and u = 15.
So Betty donated $15.

0 Replies 1 Like