Adam has a wire which is 320 cm long.
He cuts the wire into 3 pieces.
The first piece is 4 times as long as the second piece.
The third piece is 300 cm long.
- Find the total length of the first and third pieces.
- Find the difference in length between the second and the third piece.
(a)
Focus on the sentence with the word '
times'.
Assign 1 u to the variable that is found after the word '
times'.
Length of second piece = 1 u
Length of first piece = 4 u
Length of third piece = 300 cm
Length of the second and the third pieces
= 320 - 300
= 20 cm
4 u + 1 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Total length of the first and third pieces
= 4 u + 300
= 4 x 4 + 300
= 16 + 300
= 316 cm
(b)
Difference in length between the second and the third piece
= 300 - 4
= 296 cm
Answer(s): (a) 316 cm; (b) 296 cm