Question

plz help me...................​

Answer 1

Answer:

and of 19 question is

Step-by-step explanation:

5 on 11 is equal to 15 upon 31

change

5 multiply 31

11 multiply 15

151 is equal to 165

so they are not in proportion

Answer 2

Answer:

19)

let the number to be added=x

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

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

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

cancel x^2 by x^2

155+36x=165+26x

36x-26x=164-155

10x=9

x=9

10

x=0.9

5+0.9=5.9

11+0.9=11.9

15+0.9=15.9

31+0.9=31.9

5.9:11.9::15.9:31.9

____________________________________

20)

let the son's age be x

2x+8/x+8=7/4

2x+8(4)=7(x+8)

8x+32=7x+56

8x-7x=56-32

x=24

son's age=x=32 years

father's age =2x=32×2=64 years

... Hope it helps you dear.....

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