Derrick is solving a number riddle. The sum of two numbers
(x and y) is 64. The difference
between two times the first
number (x) and the second
number (y) is 5.
Find the numbers.

where is abdul's work? don't see that anywhere posted : /

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

the answer is b 4pi/3

got it down chief.