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

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

Answer 2

Answer:

13 beetles

Step-by-step explanation:

Total insects - 28

Butterflies - 7

$\frac{28}{4} = 7$

Moths - 8

$\frac{28}{7}$

4 = $\frac{1}{7}$

8 = $\frac{2}{7}$

Beetles - 13

7 + 8 + x = 28

15 + x = 28

15 - 15 + x = 28 - 15

x = 13