Let c = grams of copper to be added
(grams of silver) / (grams of copper and silver) < = .90
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%3C=+.9%28c+%2B+387%29
387+%3C=+.9c+%2B+348.3
.9c+%3E=+387+-+348.3
.9c+%3E=+38.7
c+%3E=+43g
At least 43 grams of copper must be added
check:
387+%2F+%28c+%2B+387%29+%3C=+.9
387+%2F+%2843+%2B+387%29+%3C=+.9
387+%2F+430+%3C=+.9
.9+%3C=+.9
4 = 4/1
When dividing fractions, we follow a rule called keep, change, flip.
7/8 * 1/4 = 7/32
7/32 is the simplest form.
9/16=9:16=3:4
Final answer would be 3:4
The New pay in current year is = $ 2225
The old pay in the last year was = $ 2176
percentage (%) increase formula = (new value- old value ) *100 / old value
which becomes,,
which equals to 2.3% .
Hence, the average net pay per month increased is 2.3% .
The volume of a figure is the number of cubic units present in the figure. For this problem, we assume that the figure would be a rectangular box in shape. So, the volume would be calculated by the product of its length, width and height or in this case the depth. We calculate the volume of water as follows:
Volume = 4.50 ft x 7.00 ft x 5.00 in ( 1 ft / 12 in )
Volume = 13.125 ft^3
We need to convert the resulting volume in liters. We do as follows:
Volume = 13.125 ft^3 ( 0.3048 m / 1 ft )^3 ( 1000 L / 1 m^3 )
Volume = 371.66 L