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20% of 50 marbles is 1 fifth of the marbles in the bag. so 50 marbles divided by 5 =10 blue marbles
16/20, which can be simplified if you so wish.
Ratio is a fraction. Number of total marbles is the denominator, number of red marbles is numerator. So the fraction is 35/60. This can be reduced by dividing by 5/5, so the simplest form is 7/12.
You could solve by repetitive subtraction, or division. 45/8 = 5, with remainder of 5.So 5 boys can each have 8 marbles, which is 40 marbles, and there will be 5 marbles remaining.
14/42. You have to add the amount of marbles and then put the probabilityof answers you're looking for. Ex: 14 white marbles 28 red marbles 14+28=42 ?/42 your looking for the probability of white marbles, so you put in the amount of white marbles on the fraction. =14/42