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If the RDA for vitamin C is 60. mg per day, and there are 70. mg of vitamin C per 100. g of oranges, how many 3.00 oz. oranges would you have to eat each week to meet this requirement?

Question

If the RDA for vitamin C is 60. mg per day, and there are 70. mg of vitamin C per 100. g of oranges, how many 3.00 oz. oranges would you have to eat each week to meet this requirement? 

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Step 1

The relation between oz. and g is as follows:

1 oz. = 28.3495 g

Thus,

3 oz. = 85.0485 g

The relation between g and mg is as follows:

1g = 1000 mg

Thus,

70 mg = 70×10-3 g

Step 2

100 g of oranges contain 70×10-3 g of vitamin C. Thus, 85.0485 g of oranges contain vitamin C is calculated as follows:

70x10g85.0485 g)=59.5x10" g
100g
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70x10g85.0485 g)=59.5x10" g 100g

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Step 3

The relation between g and mg is as follows:

1g = 1000 mg

Thus,

60 mg = 60×10-3 g

In one day, 60×10-3 g vitamin C is co...

60x103g(7) 420x103
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60x103g(7) 420x103

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