The number of black marbles in a jar containing 100 marbles is ; 25 black marbles
Given that:
Jar contains 100 marbles
out of every 4 marbles pulled, 1 marble = black
∴ probability of picking a black marble = 1/4
Determining the number of black marbles contained in 100 marbles
= 1/4 * Total number of marbles
= 1/4 * 100 marbles = 25 black marbles
Hence we can conclude that the number of black marbles in a jar containing 100 marbles = 25 black marbles
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