Two boys and a girl shared some money. The elder boy got 4/9 of it, the younger boy got 2/5 of the remainder and the girl got the rest. Find the percentage share of the younger boy to the girl's share.

Kwanza, fanya mgawanyiko: $81 \div 9 = 9$.
Kisha, fanya kutoa na kujumlisha: $9 - (-15) + 20 = 9 + 15 + 20 = 24 + 20 = 44$.

Kwanza, fanya mgawanyiko: $12 \div 3 = 4$.
Kisha, fanya kuzidisha: $4 \times (-2) = -8$.
Mwisho, fanya kujumlisha: $-24 + (-8) = -24 - 8 = -32$.

Unaweza pia kuandika kama desimali: $-\frac{11}{8} = -1.375$.
Jibu ni: $\boxed{\mathbf{-1.375}}$

Tunaweza kuandika $\frac{1}{0.325} = \frac{1}{3.25 \times 10^{-1}} = \frac{1}{3.25} \times 10^1$.
Kutoka jedwali la namba tete, $\frac{1}{3.25} \approx 0.30769$.
Hivyo, $\frac{1}{0.325} \approx 0.30769 \times 10 = 3.0769$.

Kwanza, tafuta $\sqrt{0.25} = 0.5$.
Hivyo, usemi unakuwa $\frac{0.5}{0.325}$.
Hii inaweza kuandikwa kama $0.5 \times \frac{1}{0.325}$.
Kutumia matokeo ya Hatua ya 1: $0.5 \times 3.0769 = 1.53845$.

$1.53845 \approx 1.5$.
Jibu ni: $\boxed{\mathbf{1.5}}$

• $\frac{1}{2} \text{ of } \frac{3}{4} = \frac{1}{2} \times \frac{3}{4} = \frac{3}{8}$.
• Ndani ya mabano: $\frac{1}{2} - \frac{2}{3} = \frac{3}{6} - \frac{4}{6} = -\frac{1}{6}$.
• Zidisha $1\frac{1}{2}$ na matokeo ya mabano: $1\frac{1}{2} = \frac{3}{2}$. Hivyo, $\frac{3}{2} \times \left(-\frac{1}{6}\right) = -\frac{3}{12} = -\frac{1}{4}$.
• Jumlisha sehemu za nambari ya juu: $\frac{3}{8} + \left(-\frac{1}{4}\right) = \frac{3}{8} - \frac{2}{8} = \frac{1}{8}$.

• $\frac{3}{4} \text{ of } 2\frac{1}{2}$: Badilisha $2\frac{1}{2}$ kuwa sehemu isiyofaa: $2\frac{1}{2} = \frac{5}{2}$.
• Zidisha: $\frac{3}{4} \times \frac{5}{2} = \frac{15}{8}$.
• Gawanya: $\frac{15}{8} \div \frac{1}{2} = \frac{15}{8} \times \frac{2}{1} = \frac{30}{8} = \frac{15}{4}$.

Jibu ni: $\boxed{\mathbf{\frac{1}{30}}}$

Acha jumla ya pesa iwe $P$.
Sehemu ya kijana mkubwa = $\frac{4}{9} P$.
Salio baada ya kijana mkubwa = $P - \frac{4}{9} P = \frac{5}{9} P$.

Sehemu ya kijana mdogo = $\frac{2}{5}$ ya salio = $\frac{2}{5} \times \frac{5}{9} P = \frac{2}{9} P$.

Jumla ya sehemu za wavulana = $\frac{4}{9} P + \frac{2}{9} P = \frac{6}{9} P = \frac{2}{3} P$.
Sehemu ya msichana = $P - \frac{2}{3} P = \frac{1}{3} P$.

Uwiano wa sehemu ya kijana mdogo kwa sehemu ya msichana ni:

Ili kupata asilimia, zidisha kwa 100%:

Zungusha kwa tarakimu 2 za desimali: $66.67\%$.
Jibu ni: $\boxed{\mathbf{66.67\%}}$