exam Maths Puzzle Numerical Ability

i need to find the simple interest

prinipal: $21,ooo
rate:5.25%
time: 18 years
thanks for helping

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exam Other Question

How much pure alcohol must be added to 40 oz of a 25%
solution to produce a mixture that is 40% alcohol? what is 5x+14-2x=9-(4x+2) and maybe you could show me (5/2)-(x+1)=x(2-x) please help this stuff is new to me.