Question

when 11 is diminished from twice a number,the result is 21.

Answer 1

2x-11=21
2x=21+11
x=32/2
x=16


And the number is 16

Answer 2

hey friend
here is ur answer. hope this helps
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$let \: the \: no. \: be \: x \\ acording \: to \: question \\ \\ 2x - 11 = 21 \\ \\ 2x = 21 + 11 = 32 \\ \\ x = 32 \div 2 = 16$
so
the required number is 16