Kelvin had $8x.
John had 25/100 * $8x = $2x more than Kelvin.
So, John had $8x + $2x = $10x.
David had $20 more than Kelvin, so he had $8x + $20.
Ann had 1/4 * ($8x + $20).
If the total amount of money the 4 children had was $200, their total amount of money is $8x + $10x + $8x + $20 + 1/4 * ($8x + $20) = $34x + $60.
Therefore, $34x + $60 = $200.
Hence, $34x = $200 - $60 = $140.
Therefore, Kelvin had $8x = $140/$34 * $8 = $280/$17 = $16.47. Answer: \boxed{16.47}.
John had 25% more money than Kelvin. David had $20 more than Kelvin and Ann had 1/4 of the amount of money David had.
(a) If Kelvin had $8x, how much more money than Ann did David have, in terms of x?
(b) If the total amount of money the 4 children had was $200, find the amount of money Kelvin had.
1 answer