Sunglasses Emporium

HELP!!!! math 2 problems. THANKS!!!?

1. A new alloy is made by mixing 8 parts of iron, 3 parts of zinc, and 1 part of tungsten. How much of each metal is needed to make 420 m3 of the alloy?
A. 260 m3 of iron, 120 m3 of zinc, and 40 m3 of tungsten
B. 280 m3 of iron, 105 m3 of zinc, and 35 m3 of tungsten
C. 240 m3 of iron, 90 m3 of zinc, and 30 m3 of tungsten
D. 300 m3 of iron, 90 m3 of zinc, and 30 m3 of tungsten

2. The Beach Hut purchased a supply of Sunglasses and visors. The ratio of sunglasses to visors is 7 : 4. Each pair of sunglasses costs $6.00, each visor costs $4.50, and the total bill is $720. How many pairs of sunglasses were purchased? (Hint: Make a number-price-cost chart.)
A. 48
B. 72
C. 84
D. 96

Thanks!!!

1.Sum of ratios=8+3+1=12
Qty. of Iron=420 m^3*8/12=280 m^3
Qty. of zinc=420m^3*3/12=105 m^3
Qty. of tungsten=420 m^3*1/12=35 m^3
Therefore B is correct
2.C is correct

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