Wednesday, September 28, 2011

Percentage P6 2011 Nanyang SA2 P2 Q17

17. Packet A, Packet B and Packet C each contained some salt. At first, there were 200 g more salt in Packet A than Packet B. Packet C had 3/4 of the amount of salt in Packet A. After 1/8 of the amount of salt in Packet A was transferred to Packet B, there was 82.15 g of salt in Packet B. How many percent less salt were there in Packet C than Packet A at first? [5 marks]  {Should be be at the end instead of at first?}
Answer given: 25%

1 - 3/4 = 1/4

1/4 x 100%  = 25%

It was 25%.

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