self Maths Puzzle

Roy is now 4 year older than Erik and 2 years older than Iris.If in 2 years ,Roy will be twice as old as Erik,then in 2 year what would be Roy's age multiplied by Iris's age?

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self Other Question

find the unit place digit of (1!)^3+(2!)^3+(3!)^3+...+(100!)^3 find the sum of 1!+2!+31+...+100!