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Daniel [21]
3 years ago
14

A scientist removed a sample of 39.1 grams of a chemical from a container. The sample was 5 3/4 grams less than 3/10 of the tota

l mass of the chemical in the container. What was the total mass, in grams, of the chemical in the container before the scientist removed the sample of 39.1 grams?
Mathematics
1 answer:
Verizon [17]3 years ago
4 0
The total mass was 149.5 grams.

Setting up an equation, we have that the sample size, 39.1, is 5 3/4 (5.75) grams less than 3/10 of the total mass; this gives us

39.1 = 3/10x - 5.75

Adding 5.75 to both sides, we have
44.85 = 3/10x

Multiplying both sides by 10,
448.5 = 3x

Dividing both sides by 3,
149.5 = x
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