Question

A bag contains white marbles and red marbles, 20 in total. The number of white

marbles is 5 more than 2 times the number of red marbles. How many white marbles
are there?
Answer:
white marbles
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Answer 1

Let x = number of white marbles and y = number of yellow marbles.

x + y = 57 => x = 57 - y

Also, x = 3 + 5y

Substitute x for y.

57 - y = 3 + 5y => 57 - 3 = 54 = 6y

So, y = 9

Since x (our answer) = 3 + 5 (9),

x = 48.

Check: 48 + 9 = 57 total