10. Usta yasagan detallarning \(\frac{1}{3}\) qismicha yana detal yasaganda, 120 ta detal yasagan bo‘lar edi. Usta nechta detal yasagan?

Ustaning yasagan detallari sonini \(x\) deylik. Shartga ko‘ra:

\[x+\frac{x}{3}=120\]

\[\frac{4x}{3}=120,\qquad x=120\cdot\frac{3}{4}=90\]

Javob: 90 ta detal.