To determine the answer, we need to set up equations. We do this by doing mass balances. We let
x = A alloy 25% copper
y = B alloy 55% copper
Overall Mass balance:
x + y = 100
Copper mass balance:
.25x + .55y = .43(100) = 43
SOlving simultaneously, we get:
x = 99.67 kg 25% copper alloy
y = 0.33 kg 55% copper alloy
Answer:
222 small ones and 74 middle ones
Step-by-step explanation:
The computation is shown below:
Let us assume medium ones be x
so the small ones be 3x
And, the total is 296
So, the equation is
x + 3 x = 296
4x = 296
Medium ones = x = 74
And, the small ones is = 3 × 74
= 222
35 divided by 12 is 2
So D is the answer
Answer:Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number. So, for instance, 2728 has alternating sum of digits 2 – 7 + 2 – 8 = -11. Since -11 is divisible by 11, so is 2728.
Hope this helped
