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## Question

primary 6 | Maths
| Measurement

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Please teach me. Thanks

ratio of red to blue beads at the end = 2 : 5

So 1/3 of blue beads = 5 units

Total blue beads = 5 units x 3 = 15 units

Notice that the ratio at the start is 3 : 5.

But the total number of blue beads is 15 units. So we change the ratio.

3 : 5 = 9 : 15

so we have 9 units of red beads and 15 units of blue beads at first.

Red beads used

= 9 units - 2 units

= 7 units

7 units = 21 beads

1 unit = ?

From here you should be able to solve.

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