Hi <Strawberry>

Your Clarification:

Answer is 735.. But I don't understand how they get 7u + 42 = 9 u - 24 (how to get 24?)

My worked solution may not be exactly the same as what was provided. But based on your clarification, the (24) comes from this statement in the question as follows:

**The number of beads Shamila gave away was 4/7 of the number of beads Rui Wen had at first.**

<gave away>

S: -(4/7)[1u + 42] = - (4u/7) - 24

Hope this helps you to understand why theres (- 24) now??

Do let me know again if further clarification is needed.

Cheers and all the best,

Edward