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  Lynette Evon Tanya
Pens bought 20u

50% more than Lynette

1.5 × 20u = 30u

10% fewer than Evon

0.9 × 30u = 27u

Gave Tanya – 2p – 7p + 9p
In the end 20u – 2p 30u – 7p

54u

(twice as before)

From Tanya

27u + 9p = 54u

9p = 27u

1p = 3u

In the end, Lynette had 15 more than Evon

20u – 2p = 30u – 7p + 15

20u – 2(3u) = 30u – 7(3u) + 15

14u = 9u + 15

5u = 15

1u = 3

 

Number of pens Evon gave to Tanya -> 7p = 21u = 21 × 3 = 63

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