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If Betty bought 2u beads at first,  she used u beads to make a necklace and left with u beads.

Then she bought another 20 beads , so she had (u + 20) beads.

After giving 15 beads to her sister, she was left with (u + 5) beads. So

u + 5 = 26

u = 21

2u = 42

Betty bought 42 beads at first. 

 

0 Replies 2 Likes ✔Accepted Answer

Sister has 15 beads and Betty has 26 beads now.

So before Betty gave 15 beads to sister, she had 26+15 = 41 beads.

She must have had only 41-20 = 21 beads before she bought 20 beads.

Therefore half of Betty’s original beads = 21 beads.

So Betty had 42 beads to begin with.

 

0 Replies 1 Like