Bunuel wrote:

A store currently charges the same price for each shirt it sells. If the current price of each shirt were to be decreased by $2, 10 more shirts could be bought for $315. What is the current price of each shirt?

A. $6

B. $7

C. $9

D. $10

E. $12

The figure $315 and the answer choices are a big cue: use divisibility rules.

There cannot be partial shirts. $315 must be divisible by the cost per shirt.

That rules out A, D, and E.

A) $6. $315 must be divisible by 2 and 3. It not divisible by 2, hence not divisible by 6. REJECT

D) $10: $315/$10 = 31.5 shirts. OR: $315 does not end in 0. (Not an even number divisible by 5, not divisible by 2 and 5.) REJECT

E) $12: $315 must be divisible by 6 and 2. From above, $315 is not divisible by 6. REJECT

That leaves B and C.

Try C) $9

$315/$9 = 35 shirts

Price decreases by $2

($9 - $2) = $7

$315/$7 = 45 shirts = 10 more shirts if price is $7

Answer C

_________________

In the depths of winter, I finally learned

that within me there lay an invincible summer.

-- Albert Camus, "Return to Tipasa"