Craig made some cookies. He used 1/2 cup of sugar
and 1/4 cup of flour. How many cups of dry
ingredients did Craig use?
A.) 3/8cups
B.) 1/4cups
C.)1/3 cups
D.) 3/4

if x decreases by 4 then y increases by 10

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.