To do this calculation in equation form, it is best to represent it, as the following:
15 Pounds x 0.4 = 6 Pounds
(40% = 0.4, as it is 40/100)
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3.5% of 40 pounds:= 3.5% * 40= 0.035 * 40= 1.4 pounds
15/40 = 37.5 percent
40% of 360 pounds = 360*40/100 = 144 pounds.
40 percent !
15 x 100/40 ie 37.5%