A bag contains 120 marbles. Some are red and the rest are black. There are 19 red marbles for every black marble. How many red marbles are in the bag? Explain your reasoning.
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Answer:
114
Step-by-step explanation:
as 1 black + 19 red = 20 marbles makes 1 set of 20 marbles
if we see the total no. we can say that there are 6 such sets
so if the same rule is applied to this case
120 marbles = 6 sets = 6[1] black + 6[19] red marbles
hence there are 114 red marbles (114 = 6 * 19)
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