That means that for every ten marbles, 7 are blue.
40 = 4 * 10
4 * 7 = ?
There are 3 red marbles for every 7 blue marbles in a box.
If the box has 40 marbles, how many marbles are blue?
______ marbles are blue.
2 answers
3 red marbles + 7 blue marbles = 10 marbles
The box has 40 marbles , that is 4 times more than 10.
4 ∙ 7 = 28 blue marbles
4 ∙ 3 = 12 red marbles
Checking the results:
7 blue marbles / 3 red marbles = 28 blue marbles /12 red marbles
7 / 3 = 28 / 12
7 / 3 = 4 ∙ 7 / 4 ∙ 3 = 7 / 3
The box has 40 marbles , that is 4 times more than 10.
4 ∙ 7 = 28 blue marbles
4 ∙ 3 = 12 red marbles
Checking the results:
7 blue marbles / 3 red marbles = 28 blue marbles /12 red marbles
7 / 3 = 28 / 12
7 / 3 = 4 ∙ 7 / 4 ∙ 3 = 7 / 3