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17. In the beginning,

R : B : G = 15 : 12: 28

B + G = 40u

A decrease of 25% of ( B + G ) results in 30u being left. 

Red balloon remained unchanged.

15u + 30u = 1440

u = 32

(a)

55u = 1760

Mr Wong had 1760 balloons at first.

(b) 10u = 320

320 – 168 = 152

152 green balloon burst. 

 

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