self Maths Puzzle Logical Reasoning Coding Decoding

there are two equations-
sqrt(x)+y=11.
x+sqrt(y)=7.
both the equations are satisfied witn x=4 & y=9...
I want to know how will it calculate.

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self Other Question

3, 12, 7, 26, 15, ? 1*8+1=9
12*8+2=98
123*8+3=987
1234*8+4=9876
12345*8+5=98765
123456*8+6=987654
1234567*8+7=9876543
12345678*8+8=98765432
123456789*8+9=987654321