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Kelly is making a beaded bracelet with beads that measure 4 mm and 7.5 mm long. If the bracelet is 15 cm long and Kelly uses the same number of each type bead, about how many beads will she use?

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Answer: 260.869 bead
In this case, Kelly will use the same number of each type bead. Then you must calculate the bead mean length. The calculation will be:
2 bead= 4mm + 7.5mm
2 bead= 11.5mm
1 bead= 5.75m

Then, divide the bracelet length with bead mean length
15cm x 100mm/cm / (5.75/bead)= 260.869 bead.

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