book Maths Puzzle Numerical Ability

x+y=10,x*y=20 find the value of x,y

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book Other Question

Mike has 3x more nickels than Larry has dimes. Mike has $.45 more money than Larry. How much money does Mike have? The attendence at a ball game was 400 people. Student tickets cost $2 and adult tickets cost $3. If $1050 was collected in ticket sales, how many of each type of ticket were sold