zozo72
10.01.2021 •
Mathematics
An alloy is made by mixing metals A and B in the ratio 3:5
metal a costs £42 per kg
metal b costs £20 per kg
how much would it cost to make 400g of the alloy?
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Ответ:
11.3
Step-by-step explanation:
First solve how many grams of each mineral you need.
To do this use this equation
Solve the system of equations to get
x=150, y=250
Since there are 1000 grams in 1 kg then the amount of kg of each material you need will be
So you need to 0.15 of a kg of mineral a and 0.25 kg of mineral b.
Multiply 0.15 by 42 to get the amount of money needed to buy mineral a.
0.15*42=6.3
Multiply 0.25 by 20 get the amount of money needed to buy mineral b.
0.25*20= 5
Add them to get the final amount
6.3+5=11.3
Ответ:
Option (3)
Step-by-step explanation:
In a right triangle,
Cosine rule →
Sine rule →
In the given triangle,
By cosine rule,
Or cos(h°) = z ÷ x
Therefore, Option (3) will be the answer.