PSLEEthan pushes two sticks, R and S, straight into the ground until the length of each stick that is above the ground is the same.
14 of R and
16 of S are in the ground. The length of R in the ground is 8 cm longer than the length of S in the ground. What is the total length of sticks R and S?
Fraction of Stick R above ground
= 1 -
14 =
34 Fraction of Stick S above ground
= 1 -
16 =
56 Heights of Sticks R and S above ground are the same.
34 R =
56 S
1520 R =
1518 S
Length of Stick R more than length of Stick S
= 20 u - 18 u
= 2 u
2 u = 8
1 u = 8 ÷ 2 = 4
Total length of Sticks R and S
= 20 u + 18 u
= 38 u
= 38 x 4
= 152 cm
Answer(s): 152 cm