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chococolates : sweets
45 units : 55 units
45 units : 55 units + 150

45 units = 30% = 0.3
55 units + 150 = 70% = 0.7
45 x 0.7 = 31.5 units = (55 units + 150) x 0.3 = 16.5 units + 45
1 unit = 45/(31.5 – 16.5) = 3
55 units + 150 = 55 x 3 + 150 = 315

Ans : 315 sweets.

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This is a Before After question. 

   Before  Transfer  After 
Sweet 55u + 150 55u + 150
Chocolate  45u   45u

(55u + 150) / 70 = 45u /30

1650u + 4500 = 3150u 

4500 = 3150u – 1650u

1500u = 4500

1u = 4500 ÷ 1500 = 3

55u = 3 × 55 = 165

165 + 150 = 315 sweets

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If you are interested to learn more about this method, you may search “Table Method” in this site. 

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