Question

plz help me ................................​

Answer 1

Answer:

Q19) The no. is 1

Step-by-step explanation:

Let the no. =x

a=5+x

b=11+x

c=15+x

d=31+x

ATQ

a/b=c/d

5+x/11+x=15+x/31+x

(5+x)(31+x)=(11+x)(15+x)

155+5x+31x+x^2=165+11x+15x+x^2

36x+x^2-26x-x^2=165-155

10x=10

X=1