Question

In a garden, there were 10 rose plants and 15 lily plants. How many rose plants should be added so that 70% of the plants in the garden are rose plants?
After adding r roses:

The number of rose plants = _______ + r

The total number of plants =​

Answer 1

Answer:

Number of lily plants = 90

Percentage of lily plants = 15%

Let the number of total plants be 'x'.

According to question, we get that

\begin{gathered}0.15x=90\\\\x=\dfrac{90}{0.15}\\\\x=600\end{gathered}

0.15x=90

x=

0.15

90

x=600

So, number of rose plants would be

\begin{gathered}0.6\times 600\\\\=360\end{gathered}

0.6×600

=360

Percentage of marigold plants = 100-(60+15)=100-75=25%

So, Number of marigold plants would be

\begin{gathered}0.25\times 600\\\\=150\end{gathered}

0.25×600

=150