Hello,
let x be the amount of the 2%-solution
let y be the amount of the 12%-solution
Then you get 2 simultanous equations:
A: x+y=150
B: 0.02*x+0.12*y=0.08*150=12
Multiply the equation B by 50 and calculate 50*B-A:
5y=450. Thus y = 90. Plug in this result into A. You'll get x = 60.
EB
Hello,
to 21.)
Thus the exact solutions are:
Approximate resultes: x = -2.8 or x = -7.3
to 22.)
A produkt is zero if one of the factors is zero. Thus you'll get the solutions: x = -3 or x = 8
to 23.)
Use the formula you know to solve this equation:
. Thus x = 4 or x = -3/2
to 24.) Multiply denominator and numerator with the conjugated(?) value of the denominator:
EB