Step-by-step explanation:
Mogę nie mówić w twoim języku, ale przetłumaczę go na twój, mówię po angielsku, jeśli możesz iść do google i wpisać, co chcesz mi powiedzieć, i wpisz tłumacz na angielski
jakie jest pytanie?
Try this way:
1. note, that in such tasks mass of <u>pure</u> copper before merging and after merging is the same (this is the base);
2. If the mass of pure copper in alloy with 40% solution is 'x' and the mass of pure copper in alloy with 80% solution is 'y', then It means before merging was x/0.4 and y/0.8, after merging was (x+y)/0.7. It is one equation of the future system.
3. Using 120 kg. of 70% solution, it is possible to define mass of pure copper after merging, 120*0.7(=84 kg.). And before merging it was 'x+y' kg. of pure copper. It is the second equation of the future system.
4. according to the items no.2&3 (to make up the system of two equations and solve it). All the details are in the attached picture.
5. pure copper in 40% solution is 12 kg., pure copper in 80% solution is 72 kg. It means, that the copper alloy with 40% solution is x:0.4=12/0.4=30 kg., and the copper alloy with 80% solution is y:0.8=72/0.8=90 kg.
Answer:
Step-by-step explanation:
(x + 0)/2 = 3
x + 0 =6
x = 6
(y + 0)/2 = 4
y + 0 = 8
y = 8
(6, 8)
Answer:
The answer is 15
Step-by-step explanation:
because so the squirrel hid 40
so
||||| ||| 8
||||| ||| 16
||||| ||| 24
||||| ||| 32
||||| ||| 40
so if you count the all the group of 3 that will get your answer.
let me know if this make sense.
Answer:
The diameter is 6. The radius is half the diameter, so it is 6 units.
Step-by-step explanation: