a)0.125kg=1.25hg=12.5dag=125g=1250dg
5dag=50g=500dg
7hg=70dag=700g=7000dg
1250dg+500dg+7000dg=8750dg
b)7dag=70g
58g+70g=128g
128g-32g=96g
deci=58g+7dag-960dg=32g
c)150cg=15dg=1.5g=0.15dag
2500mg=250cg=25dg=2.5g=0.25dag
0.15dag+0.25dag=0.4dag
0.4dag-0.1dag=0.3dag=3g
deci=3g+150cg+2500mg=0.1dag