plz help me...................
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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
Answered by
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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