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3/8 of a box of balls are red, 3/10 of them are green and the rest are black. If there are 36 green balls, how many black balls are there?

 Nov 10, 2021
 #1
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Green ball in the box 3/10 part =36 numbers. 1unit = 120 numbers.

Red balls =3/8×120=24 numbers

Black balls=Total number of balls - red balls+ green balls= 120- 36+24=60 numbers.

 Nov 22, 2021
 #2
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Let total no. of balls be x

==> (3/10)*x = 36

==> x = 120

No. of black balls = x-(3/8x+3/10x) = 13x/40 = (13/40)*120 = 39 balls

 Nov 24, 2021
 #3
avatar+115920 
+1

3 tenths is 36

1 tenth is  12

100%   is  120

 

3/8*120 = 45

45+36 = 81

 

120-81  = 39

 Nov 27, 2021

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