Question

a small bar of gold is a rectangular prism that measures 40 millimeters by 25 millimeters by 2 millimeters. one cubic millimeter of gold weighs about 0.0005 ounce. Find the volume in cubic millimeters and the weight in ounces of this small bar of gold.

Answer 1

Step One
Find the Volume in ccs.

V= l*w*h
l =40 mm
w = 25 mm
h = 2 mm
V = 40*35 * 2
V = 2800 mm^3

Step Two
Find the weight
1 mm^3 = 0.0005
2800 mm^3 = x <<<<< answer 1


`(1)/(2800) = (0.0005)/(x)` Cross multiply.

1x = 2800 * 0.0005
x = 1.4 ounces. <<<<< answer 2