Question

An alloy is made by mixing metals A and B in the ratio 3:5

Answer 1

Answer:

11.3

Step-by-step explanation:

First solve how many grams of each mineral you need.

To do this use this equation

$\frac{3}{5} =\frac{x}{y} ; x+y=400$

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

$x=\frac{150}{1000}; y=\frac{250}{1000}$

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