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By: achieve_goal (offline)  Tuesday, October 11 2011 @ 08:06 AM CDT (Read 964 times)  
achieve_goal

The total mass of James, Lucy and David

is 130kg. James is 1 1/2 times as heavy as

Lucy and twice as heavy as David.

(a) How heavy is James?

(b) How much heavier is James than Lucy?

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By: awyw1201 (offline)  Wednesday, October 12 2011 @ 08:54 PM CDT  
awyw1201

Let mass of James be 6u
then, mass of Lucy be 4u
and mass of David be 3u

6+4+3= 13u---130
1u----10

(a) James---60 kg

(b) Diff----6-4=2u----20 kg


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