x = amount at 15%
90-x = amount of 55%
0.15x + 0.55(90-x) = 0.47(90)
0.15x +49.5 - 0.55x = 42.3
49.5 - 0.40x = 42.3
-0.40x = -7.2
x = -7.2 / -0.4 = 18 kg of 15% copper
90-18 = 72 kg of 55% copper
Answer: 3 pounds
Step-by-step explanation: 1 pound=16 ounces
Now that you know what the conversion from ounces to pounds is, you just have to divide the number of ounces in the problem (48) by 16.
48÷16=3
Never. If you set up an equation making them equal to each other and you solve it, it will give you that they are equal. Even when you divide them separately (3 by 6 and 2 by 4 ) you get 1/2 for both. You can't change that. Look in the picture
Answer = B. 4
a 4 pointed star has 4 lines of symmetry