Question

A water park had dolphins and penguins in the ratio of 2:5. The park had 35 penguins. If the number of penguins is doubled and the number of dolphins is halved, then find the present ratio of the dolphins to penguins.

• A. 2:5
• B. 14:35
• C. 1:10
• D. 7:10

Answer 1

The correct option is C 1:10

Ratio of dolphins to penguins = 2 : 5
Number of penguins in the zoo = 35
Let the number of dophins will be = x
= 2:5:: x: 35,
$\Rightarrow$ x = 14 = number of dolphins
Now, the number of penguins have doubled and the number of dolphins have halved.
$\therefore$ Number of penguins = $35\times 2$ = 70
$\therefore$ Number of dolphins = $\frac{14}{2}$ = 7
Hence, the present ratio of dolphins to penguins = 7:70 = 1:10