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How many grams are in 8 kilograms? if 100 grams = 1 kilogram

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

For what value of x does 4x = (1/8) x + 5?