Posted by joi on Wednesday, December 28, 2011 at 9:19am.
The number of Samad's stamps is 30% of Derrick's stamps. The number of Derrick's stamps is 40% of Bee Hua's stamps. If they have 608 stamps, how many stamps does Derrick have?

maths  bobpursley, Wednesday, December 28, 2011 at 9:42am
S=.3D
D=.4B
B+D+S=608

maths  joi, Wednesday, December 28, 2011 at 9:46am
sorry i can't get it, pls explain further. tks

maths  bobpursley, Wednesday, December 28, 2011 at 11:58am
first equation, combine that with the second and third equation.
S=.3D
S=.3*.4D
Put that into the last equation.
1) B+D+.12D=608
now, solve for B in the second equation
B=D/.4=2.5D Now put that in your equation 1) above, solve for D
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