A sum of rs. 8000 was lent partly at 7% and partly at 9% simple interest. if the total annual interest be rs.620, the ratio in which the money was lent at given rates is,
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let X money is given for 7% and 8000-X is given for 9%
620= X*7*1/100 + (8000-X)*9*1/100
620*100= 7X + 9(8000-X)
62000= 7X+ 72000- 9X
2x= 10000
x=5000
ratio= x/ 8000-x
= 5000/3000
=5/3
620= X*7*1/100 + (8000-X)*9*1/100
620*100= 7X + 9(8000-X)
62000= 7X+ 72000- 9X
2x= 10000
x=5000
ratio= x/ 8000-x
= 5000/3000
=5/3
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