Question

Una has a collection of 28 insects. 1/4 are butterflies, 2/7 are moths, and the rest are beetles.

How many insects are beetles?​

Answer 1

13 beetles

Explanation:

Total insects - 28

Butterflies - 7

`(28)/(4) = 7`

Moths - 8

`(28)/(7)`

4 =
`(1)/(7)`

8 =
`(2)/(7)`

Beetles - 13

7 + 8 + x = 28

15 + x = 28

15 - 15 + x = 28 - 15

x = 13

Answer 2

28 * 1/4 = 7
28 * 2/7 = 8
7 + 8 = 15
28 - 15 = 13