exam Maths Puzzle Numerical Ability

Someone.....please help!!!!
7s+1 (all under the radical sign) - 2 radical sign s= 2
book gives the answer as 9, can someone show me how???

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Congruent angles result if an obtuse angle is Bisected Jessica has 16 dimes and quarters. Whitney has twice as many dimes and 1/3 as many quarters as Jessica has. If they both have the same amount of money, what coins do each have?