exam Maths Puzzle Numerical Ability

Can someone help me calculate the 20th partial sum for 6400,1600,400,100,25...?

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write a algebric equation for it

Subtract 7 from the sum of y and 22 times 5 and the result is 92
A GARDEN AREA IS 30FT LONG AND 20FT WIDE. A PATH OF UNIFORM WIDTH IS SET AROUND THE EDGE. IF THE REMAINING GARDEN AREA IS 400FT^2 WHAT IS THE WIDTH OF THE PATH?