Solution :

6 chair  can accommodate the number of people are:

72 - 36 = 36 (people)

1 chair  can accommodate the number of people are:

36 : 6 = 6(people)

3 chair  can accommodate the number of people are:

6  x 3=18 (people)

Answer: 18 people

The number of minutes to cut a log into 1 piece is:

30 : 6=5(minutes)

The numbers of minutes to cut a log into 9 piece is:

5 . 9=45(minutes)

Answer : 45 minutes

1000+250+900+300+700+100+750

=(250+750)+(900+100)+(300+700)+1000

=1000+1000+1000+1000

=1000. 4

=4000

50+70+90+30+10

=(70+30)+(10+90)+50

=100+100+50

=200+50

=250

= ( 18 + 25 + 7 ) . 3

= ( 43 + 7 ) .3

= 50.3

= 150

= 8.8 + 5.5 + 15.15

= 64 + 25 + 225

= 64 + (25 + 225)

= 64 + 250

= 314

You left

130 - 100 =30 (apples)

Answer : 30 apples

50 + 300 + 50 + 100

= ( 50 + 50 ) + ( 300 + 100 )

= 100 + 400

= 500

20 + 80 + 40 + 50 + 20 + 60

= ( 20 + 80 ) + ( 40 + 60 ) + ( 50 + 20 )

= 100 + 100 + 70

= 200 + 70

= 27

60 + 20 + 80 + 30 + 50 + 10

= (20 + 80) + (30 + 10 + 60) + 50

= 100 + 100 + 50

= 200 + 50

= 250

She used :

29 - 19 =10 (eggs)

Answer : 10 eggs

There are 10 different letters

= 

=(40+60)+(35+65)+(50+50)+10

=100+100+100+10

=100x3+10

=300+10

=310

k mk nha