2/5 abad+3 dasawarsa-35 tahun=

2/5 x 100 + 3x10 - 35
= 40+35-30
= 45 tahun

[tex] \frac{2}{5} \times 100 + 3 \times 10 - 35 \\ = 40 + 30 - 35 \\ = 70 - 35 \\ = 35thn[/tex]