exam Maths Puzzle Numerical Ability

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

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given: g is between f and h. h is between g and j.
Prove:fg + gj = fh + hj 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%.