The Bead Problem

The Question:

beads.png

BLYs Method

bead

HSAs MethodBead Question

SMAs Method

Would have done it similarly but without introducing the variable B, so all in terms of R

R : 4R

R+7 : 3(R+7)

We know the Bs were unchanged so

4R = 3(R+7)

Giving us R=21

And then B is 3(21+7)=84

One thought on “The Bead Problem

  1. I like SMA’s approach of focusing on the unchanged and leaving in terms of r; although I’d use x to represent number of beads (any colour) since I’m predicting that pupils will be confused with blue beads represented with r.

    HSA’s approach is really neat and demonstrates some pretty smooth thinking. 💭 BLY

    Like

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