Problem Solving

1. If a sequence of 8 consecutive odd integers with increasing values has 9 as its 7th term, what is the sum of the terms of the sequence?
(A) 22 (B) 32 (C) 36
(D) 40 (E) 44

Ans:

-5 -3 1 3 5 7 9 11
Toatal is 28????

2. A family made a down payment of $75 and borrowed the balance on a set of encyclopedias that cost $400. The balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9. The amount of interest paid was what percent of the amount borrowed?
(A) 6%
(B) 12%
(C) 14%
(D) 16%
(E) 20%

??

3. The price of a model M camera is $209 and the price of a special lens is $69. When the camera and lens are purchased together, the price is $239. The amount saved by purchasing the camera and lens together is approximately what percent of the total price of the camera and lens when purchased separately?
(A) 14%
(B) 16%
(C) 29%
(D) 33%
(E) 86%

??

Let me know.
Thanks!

for q1...you're missing -1

suyog, can you please make sure to post ONE question per thread.. thanks

Q1 - Seq is -3 -1 1 3 5 7 9 11. Sum = 32

Q2 - Amount Borrowed = 400-75 = 325

Total amount paid as installments = 23*16 + 9 = 377

Total interest paid = 377-325 = 52

% int = 52*100/325 = 16%

Q3 - Total price of camera and lens when purchased separately = 209+69 = 278.

When purchased together = 239

Saving = 278-239 = 39

% Saving = 39*100/278 = 14.03 %

Agree for 1) 32; 2) 16% ; 3) 14%

Thanks guys!!!