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let the number be A,
then
83% of A = 498,
83/100 × A =498,
then
A = 498×100/83,
A = 6×100,
A=600,
3):-
let the number be A,
then
127% of A = 508,
127/100 × A =508,
then
A =508 × 100/127,
A=4×100,
A=400,