Question

How many sides do 5 triangles, 2 decagons, and 2 octagons have in all?

Answer 1

Answer:

51 sides

Step-by-step explanation:

triangles: 3 sides

decagons: 10 sides

octagons: 8 sides

3x2=15

2x10=20

8x2=16

add them =51 sides

Answer 2

Answer:

The answer is 51.

Step-by-step explanation:

Add 5 triangles,

Triangles (3 sides, 5 x 3 = 15, )

Decagons, (10 sides 10x2= 20) |  15+20=35

Octagons ( 8 sides. 8x2= 16.)    | 35+16=51.

Hope this helps.... :)