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Q: What is 20 subtracted from - 30?

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20 + 10 = 30 20 x 10 = 200 200 - 30 = 170 Your answer is 170.

The question can be rewritten as the following equation: (20%x + 60%100)/(100+x) = 30% Where x is the amount of 20% copper you need to add. This equation can be solved by first multiplying both sides by (100+x) to get: 20%x + 60%100 = 30%100 + 30%x Now 30%100 can be subtracted from both sides 20%x + 30%100 = 30%x Now 20%x can be subtracted from both sides 30%100 = 10%x Now both sides can be divided by 10% 300 = x Thus you need to add 300 ounces of 20% copper alloy in order to get an alloy that totals 30% copper.

27

which least number should be subtracted from 1000 so that 30 divides the difference exactly

If three is subtracted from the product to get 17, the product must be 20. Then find what number can be multiplied by 5 to get 20. The answer is 4.

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30. 20--10, two-'s equals +. 20+10=30

3.47 subtracted from 20 = -16.53

2.3 subtracted from 20 = -17.7

20 + 10 = 30 20 x 10 = 200 200 - 30 = 170 Your answer is 170.

1980 subtracted by 2010 = -30

2013 subtracted from1993 = 20

7 hours subtracted by 30 minutes = -23

9 metres 20 centimetres - 7 metres 30 centimetres = 1 metre 90 centimetres.

40 + 15 60 - 5 30 + 25 75 - 20

-20

48

(X - 30) does.

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