Question

There are 10 blue marbles, 8 pink marbles, and an unknown amount of green marbles. How many marbles are in the bag if there are 30 marbles in total?

Answer 1

12

Explanation:

10+8=18

30-18= 12

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Answer 2

`\huge\boxed{12\ \text{marbles}}`

Find how many blue and pink marbles there are in all.
`10+8=\boxed{18}`

Subtract that from
`30`.
`30-18=\large\boxed{12}`