Simplify the fraction on the right side.

$$\frac{y}{5} = \frac{3}{5}$$

Multiply both sides by 5:

$$y = 3$$

The correct option is (d).

The final answer is $\boxed{\text{3}}$.

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21. Which of the following is divisible by 8 without a remainder?

(a) 38 (b) 49 (c) 58 (d) 64 (e) 84