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Ans 2:
Class : Class 7
Average=sum of the no. ÷ no. of numbers....11+12+13+14+x=13÷5,50+x÷5=13,50+x=13×5,50+x=65,x=65-50=15......answer = 15
Ans 3:
Class : Class 10
(11+12+13+14+x)DIVIDED BY 5 = 13
(55+x)/5=13
55+x=13x5
55+x=65
x=65-55
x=15
therefore,the value of x is 15.
Ans 4:
Class : Class 8
15.
11+12+13+14+x/5 = 13
11+12+13+14+x = 65
50+x = 65
x= 65-50
x = 15
as simple as that
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Ans 1:
Class : Class 7
Equation: ((5(4+n))- 20)/8= 10
= (5(4+n))- 20= 10x8
= 5(4+n)= (10x8)+ 20
=4+n= (10x8+20)/5
=n= ((10x8+20)/5)- 4
=n= (100/5)- 4
=n= 20- 4
n=16
Ans 2:
Class : Class 7
Let the no. Be x
5(4+x)-20/8=10
20+5x-20/8=10
5x/8=10
5x=10×8
5x=80
X=80/5
X=16
According to me.
Ans 3:
Class : Class 8
Let, 3rd no. = x,
Let, 2nd no.= 20/100 (also N1),
Let, 1st no. = 50/100 (also N2),
Then,
Ratio of 1st to 2nd no. = (50/100)/(20/100) =1/2(i.e. 50/100)*5(i.e. 1/{20/100}=100/20}
OR Ratio of 2nd no. to 1st no. =Vice versa of (N1:N2)= 2:5