(2x^2+9)(4x^2−18x^2+81)

I think...

9 - 1 = 8

8 / 2 = 4

4 * 8 = 32

Total stamps Kaden and Dave bought --> 32 - 1 - 9

=22

Kaden and Dave bought 22 stamps altogether.

Actually 76 was right :)

223 x 2 + 2 x 277 = 1,000

Blue -> 3/8 of the total 3/8

Red -> 1/4 of the total 1/4 = 2/8

Yellow -> 5/6 of the remainder

Blue = 3/8

Red = 1/4

the remainder

1 - 3/8 - 1/4

1 - 3/8 - 2/8

Yellow = 5/6 * 3/8 = 5/16

5/16 -> 20

1/16 -> 20 / 5 = 4

16/16 = 4 * 16 = 64