PSLEKen pushes two poles, R and S, straight into the ground until the length of each pole that is above the ground is the same.
18 of R and
111 of S are in the ground. The length of R in the ground is 24 cm longer than the length of S in the ground. What is the total length of poles R and S?
Fraction of Pole R above ground
= 1 -
18 =
78 Fraction of Pole S above ground
= 1 -
111 =
1011 Heights of Poles R and S above ground are the same.
78 R =
1011 S
7080 R =
7077 S
Length of Pole R more than length of Pole S
= 80 u - 77 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Total length of Poles R and S
= 80 u + 77 u
= 157 u
= 157 x 8
= 1256 cm
Answer(s): 1256 cm