PSLEFabian pushes two sticks, R and S, straight into the ground until the length of each stick that is above the ground is the same.
16 of R and
18 of S are in the ground. The length of R in the ground is 12 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 -
16 =
56 Fraction of Stick S above ground
= 1 -
18 =
78 Heights of Sticks R and S above ground are the same.
56 R =
78 S
3542 R =
3540 S
Length of Stick R more than length of Stick S
= 42 u - 40 u
= 2 u
2 u = 12
1 u = 12 ÷ 2 = 6
Total length of Sticks R and S
= 42 u + 40 u
= 82 u
= 82 x 6
= 492 cm
Answer(s): 492 cm