isa6476
18.10.2019 •
Mathematics
Eduardo dissolved as much salt as he could into a beaker of water. he did not measure the salt as he put it in, but he wanted to know how much salt had dissolved into the water. he weighed the saltwater and the beaker. the total mass of both was 156 g. eduardo gently heated the beaker of saltwater until all the water evaporated, then weighed it again.
the salt and beaker together massed 56 g. when he removed all the salt from the beaker, the beaker weighed 20 g.
how much salt did eduardo dissolve into the water?
136 g
36 g
76 g
100 g
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Ответ:
Beaker weighs 20g
Therefore salt weighs 56 - 20 = 36g
PS the total mass (156g) is a red herring!
Ответ:
The correct answer is:
There are 4 zeros in the product, compared to 3 zeros in the factors.
Explanation:
When multiplying factors, the product will have at least as many zeros as the combined number of zeros from all factors.
5000 has 3 zeros, and 8 has none; this means the product will have at least 3 zeros.
Multiplying the first number from each, 5*8 = 40; this gives another zero to the product, making a total of 4.
Checking this, 5000(8) = 40,000, which has 4 zeros.