exam Maths Puzzle Numerical Ability

how do you find the area of a triangle when the only given number is 5

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exam Other Question

s^2-13s+42=0

a^2+2a-35=0

v^2-15v+54

v^2+12v+27=0
Please can you help me? Amanda has 500 in ten dollar, five dollar, and one dollar bills. There were 100 bills in all, and 20 more five dollar bills than ten dollars bills. How many one-dollar bills did Amanda have? Round to nearest whole number