Answer:
3.
Karl= 9 years old
Simon = 11 years old.
Solution:
Let K be the age of Karl.
S (Simon's age) = K + 2
K + (K + 2) = 20
2K + 2 = 20
2K + 2 - 2 = 20 - 2
2K = 18
2K / 2 = 18 / 2
K = 9
Karl's age = 9 years old.
To find SIMON'S AGE:
K + 2 = S
9 + 2 = S
11 = S
Simon's age = 11 years old.
5. 40 cm, 100 cm, and 140 cm
Solution:
2:5:7 = 280cm
2+5+7 = 14
280 ÷ 14 = 20
2 × 20 = 40 cm
5 × 20 = 100 cm
7 × 20 = 140 cm
