Distance

Grandfather had currant bushes planted in a row. The distance between neighbouring bushes is 3 m. By the first bush he has a well and a bucket (he can water two bushes from there). How many metres does he have to travel to water all 10 bushes? By how many metres would the distance grandfather has to travel to water his bushes be reduced if he buys another bucket of the same type?

Final Answer:

l =  123 m
l₂ =  36 m

Step-by-step explanation:

$l=2\cdot 3+2\cdot (3+6)+2\cdot (3+6+6)+2\cdot (3+6+6+6)+1\cdot (3+6+6+6+6)=123\text{m}$

$$\begin{gathered} l_1=2\cdot (3+3+3)+2\cdot (9+12)+1\cdot (9+12+3+3)=87 \\ {l}_2=l-l_1=123-87=36\text{m} \end{gathered}$$

Try another example