They stayed at the beach for 7 days. 4 x 3 = 12. 12 - 5 = 7
Answer:
If you add 690 ml of water you will obtain 1.690 liter of 70% alcohol. Of course if you halve the amounts, e.g. 0.5 liter 75% alcohol and 345 ml of water, you will also obtain 45% alcohol solution.
Yes, as one half or 1/2 is also 10/20. 11/20 is greater than half by a 10% margin.
Because the ratio for both candles is 20/60 or 1/3 then take the number of ounces the candle has and divide by 1/3. In expression: 9 / 1/3 => 9 * 3 = 18
