Bunuel wrote:

How many dimes are there in 4x - 1 cents? (1 dime = 10 cents)

(A) 40x - 10

(B) 2x/5 - 1/10

(C) 40x - 1

(D) 4x - 1

(E) 20x - 5

Since there are 4x - 1 cents and a dime is 10 cents,

there will be 4x - 1/10 or 2x/5 - 1/10 dimes in 4x - 1 cents

(Option B)Alternate approach: - Using numbers

Let x = 10, making the total amount in cents be 40-1 = 39

There are 3 dimes in the this.

Evaluating answer options at x = 10

(A) 40x - 10 = 400 - 10 = 390

(B) 2x/5 - 1/10 = 2*10/5 - 1/20 = 4 - 1/20 = 79/20 = 3.

(C) 40x - 1 = 400 -1 = 399

(D) 4x - 1 = 40 - 1 = 39

(E) 20x - 5 = 200 - 5 = 195

Therefore,

Option B(2x/5 - 1/10) is the number of dimes in 4x - 1 cents.

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