Discussion

Explanation:

6 machines can produce 180 bottles per hour 

Hence, 1 machine can produce 180/6 = 30 bottles per hour and 15 bottles in 30 minutes.

∴ 15 machines can produce 15 × 15 = 225 bottles per hour.

Alternately,
$\frac{{\mathrm{M}}_1{\mathrm{H}}_1}{{\mathrm{W}}_1}$ = $\frac{{\mathrm{M}}_2{\mathrm{H}}_2}{{\mathrm{W}}_2}$

⇒ $\frac{6\times 60}{180}$ = $\frac{15\times 30}{B}$

⇒ B = $\frac{15\times 30\times 180}{6\times 60}$ = 225

Hence, option (a).

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