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  Dolly Hong
Mrs Lim gave to Dolly and Hong (7:3) 35u 15u
Dolly gave Hong 1/5 -7u +7u
In the end 28u 22u

Difference in the end -> 28u – 22u = 6u

6u = 24

u = 4

Dolly gave Hong 7u = 28 stickers

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u = 4

Total stickers -> 50u = 200

Dolly got 7/10 -> 0.7 × 200 = 140

Hong got 3/10 -> 0.3 × 200 = 60

1/5 of Dolly -> 140 / 5 = 28

Dolly in the end -> 140 – 28 = 112

Hong in the end -> 60 + 28 = 88

Difference -> 112 – 88 = 24

Checked

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Before —
Dolly : 7u x 5 = 35u
Hong : 3u x 5 = 15u

After (Dolly gave Hong 1/5 of her stickers) —
Dolly : 35 x [1 – (1/5)] = 28u
Hong : 15u + (35u – 28u) = 15u + 7u = 22u

28u – 22u = 6u ——- 24
1u ——- 24/6 = 4
7u ——- 7 x 4 = 28

Ans : 28 stickers.

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