Question

the simple interest on a certain sum for 3 whole 1 upon 2 years at 7% is 225 rupees more than the simple interest on the sum sum Sum for 4 years at 5% per cent
find the sum

Answer 1

HEYA MATE HERE IS YOUR ANSWER
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let principal be x 
n=4 years 
r= 5% p.a 
SI= x*4*5/100
SI= x/5 
II deposit 
Principal =x
r=7
n= 3 1/2 years = 7/2 years
Si= (x*7*7)/(2*100)
SI=49x/200 
II deposit interest -I deposit interest =225 
49x/200 -x/5 =225
LCD = 200
multiply by 200 to eliminate the denominator
49x-40x=225*200
9x=225*200
x=225*200/9
x= Rs 5,000 the principal