A positive no is 7 times another no. if 15 is added to both the numbers, then one of the new no becomes 5/2 times the other no. what are the numbers.
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let the no. be x and 7x
acq
15+7x=5/2(15+x)
15+7x=75/2+5x/2
7x-5x/2=75/2-15
(14x-5x)/2=(75-30)/2
9x/2=45/2
cross multiple
9x*2=45*2
18x=90
x=5
1st number= 5
2nd number = 7x
= 7*5
=35
acq
15+7x=5/2(15+x)
15+7x=75/2+5x/2
7x-5x/2=75/2-15
(14x-5x)/2=(75-30)/2
9x/2=45/2
cross multiple
9x*2=45*2
18x=90
x=5
1st number= 5
2nd number = 7x
= 7*5
=35
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