If 16 15 26 69 260 x,
Find 75% of x+ x
16 × 1 - 1², 15 × 2 - 2², 26 × 3 - 3², 69 × 4 - 4², 260 × 5 - 5², 1,275 Hence, x= 1,275 Hence, 75% of x+ x=956.25 + 1,275 = 2,231.25
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