Question

In an aquarium, the ratio of sharks to dolphins is 3 : 5 and the ratio of

dolphins to starfish is 2 : 7.
There are 6 sharks in the aquarium.
How many starfish are there?

Answer 1

Explanation:

step 1: how many dolphins

there are 6 sharks

sharks to dolphins is 3 to 5

3 S to 5 D

we can divide 6 (amount of sharks known) by 3, to get what a ratio of 1 is

6 ÷ 3 = 2

so 2 sharks is = 1 part or ratio

now we can times by 5 to get a ratio of 5

5 × 2 = 10

there are 10 Dolphins

Step 2: How many starfish

repeat the steps above but for the ratio 2: 7 where 2 is the Dolfin ratio and there are 10 dolphins

put in questions answer you got

Answer 2

35 starfish

Explanation:

shark/dolphin * dolphin /starfish = shark / starfish

Now. put in the numbers given:

3/5 * 2/7 = 6/35 = shark / starfish put in '6' for shark (given)

6/35 = 6/starfish cross multiply

6 * starfish = 35* 6

starfish = 35