Problem 1
x = width (or breadth)
x+4 = length
area = x*(x+4)
area = x^2+4x
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Problem 2
h = Sean's age
h+6 = Niel's age
2(h+6) = 2h+12 = Nikki's age
The sum of their ages is 86, so,
h+(h+6)+(2h+12) = 86
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Problem 3
x = first number
x+1 = next number after x
x+2 = largest number (after x+1)
all three numbers are whole numbers
add up the three expressions, set it equal to 177, then solve for x
x+(x+1)+(x+2) = 177
3x+3 = 177
3x+3-3 = 177-3
3x = 174
3x/3 = 174/3
x = 58
x+1 = 58+1 = 59
x+2 = 58+2 = 60
The largest of the three numbers is 60.
