Your equation would be x+6x=532. You would add the "x's" together to get 7x=532. You would then divide each side by 7 resulting in x=76. This means Sal's book has 76 pages. To get Lori's book, you just times Sam's by 6 (76×6) which is 456. Lori's book has 456 pages.
Answer:
Total number of people = 13
A:
Number of ways to choose 10 players to take the field = 13C10
= 
= 286
B:
This is given as: 13P10
=
= 
= 1037836800
C:
This is given as:
(3C1 x 10C9) + (3C2 x 10C8) + (3C3 x 10C7)
Solving this we get the answer as = 285
Consider, please, this option:
if a1=1 and r=3, then using a formula aₓ=a₁*rˣ:
1. a1=1;
2. a2=3;
3. a3=9;
4. a4=27;
5. a5=81
a = 46c....for c
a/46 = c
322 = 46c
322/46 = c
7 = c.....7 circuits are required