Question

Rohan and 6 of his friends planted 42 saplings in a field. If four more people joined them on the next day, how many saplings did they plant on the next day?

• A. 70
• B. 66
• C. 56
• D. 42

Answer 1

The correct option is B 66

Rohan and 6 of his friends planted 42 saplings.
$\Rightarrow$ 7 people planted 42 saplings in a day.
If more people join them, then more saplings will be planted.
$\therefore$ This is a case of direct proportion.
If 4 more people join the group, there will be 7 + 4 = 11 people in total.
Using the formula for direct proportion,
$\frac{\text{Number of people}}{\text{Number of saplings}}=\text{constant}$
$\frac{7}{42}=\frac{11}{\text{Number of saplings}}$
$\therefore$ Number of saplings planted on the next day = $11\times 6$ = 66