*

5+2*2+67

=5+4+67

=9+67

=76*

She draws a picture in: 240 : 20 = 12(minutes)240 : 20 = 12(minutes)

If she draws three times as fast then she draws a picture in: 12 : 3 = 4(minutes)12 : 3 = 4(minutes)

Convert: 6 hours = 360 minutes

So the number of pictures she draw is: 360 : 4 = 90(pictures)360 : 4 = 90(pictures)

Answer: 90 pictures

40% of 80 is: 40%.80 = 32

32% of 75 is: 32%.75 = 24

So the positive differnce between 40% of 80 and 32% of 75 is:

32 - 24 = 8

So 75% of it is:

8.75% = 6

x + 10 + 20 + 30 + 40 + 50 = n

x = n - ( 50 + 40 + 30 + 20 + 10 )

x = n - 150

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Lê Quốc Trần Anh is all

The last digit of the sum is : $2.10=20\equiv 0$ (mod 10)

The tens digit of the sum is : $2.9+2=20\equiv 0$ (mod 10)

The hundreds digit of the sum is : $2.8+2=18\equiv 8$ (mod 10)

So,the answer is 8

1200

good luck !

a) 34 number

   b) 148

  c) 1717

500 

good luck in summer !

11+22+33+44+...+999

=11(1+2+...+111)

=11+111+1/2x111/2

=34188

1000 - 500 - 400 = 100

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