Question

A bag contains yellow marbles and blue marbles, 23 in total. The number of yellow marbles is 7 less than 2 times the number of blue marbles. How many yellow marbles are there?

Answer 1

8

Explanation:

yellow marbles=2b-7

blue marbles=2b

2b+2b-7=23

4b=23+7

4b=30

b=30/4

b=7.5

yellow marbles=2b- 7

2 x 7.5 -7

15 - 7

=8