exam Maths Puzzle Numerical Ability

Roberto invested some money at 7%, and then invested $2,000 more than twice his amount at 11%. His total annual income from the two investemnts was $3,990. How much was invested at 11%.

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exam Other Question

x-2/3=4/5
or (x-2)/3= 4/5
0r x-2=12/5
or x=12/5 + 2/1 = (12+10)/5 = 22/5 = 4.4
Solve the rational equation

b+3/b + b+4/b+5 = 15/b^2+5b