Question

9. Jessica had 400 pebbles in her collection. - of 1/10
them were red. Of the remaining,1/3
were blue, and 100 pebbles were green . the rest were black. how many black pebbles were there?​

Answer 1

Answer:

140

Step-by-step explanation:

1/10 pebbles are red

No. of red pebbles=1/10*400=40

pebbles left=400-40=360

1/3 remaining are blue

No. of blue pebbles=1/3*360=120

pebbles left=360-120=240

100 pebbles are green and rest are black,so black pebbles

=240-100=140

Answer 2

Answer:

total no. of pebbles Jessica had=400

no. of red pebbles=1/10*400=40

no. of pebbles left=400-40=360

no. of pebbles were blue=1/3*360

=120

no. of pebbles were green=100

no. of black pebbles=360-(120+100)

=360-220

=140

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