Explanation

Let C's age be x years. Then, B's age = 2x years. A's age = (2x + 2) years.

∴ (2x + 2) + 2x + x = 27

⇒ 5x = 25

⇒ x = 5.

Hence, B's age = 2x = 10 years.

Explanation

A zoo has some lions and Parrots.

A zoo has x lions and y parrots

 The supervisor counted 15 heads and 50 legs. How many lions are there?

Heads

x + y = 15 

y = 15 – x

x = 4 legs and y has 2 legs

4x + 2y = 50

4x + 2(15-x) = 50

4x + 30 – 2x = 50

2x = 20

X = 20/2

X = 10

So x means lions, so there 10 Lions

CHECKING our answer***

  40 + 10 = 50 legs

Explanation

Kilometres ran by Ali = 4.25 km

In the question,

The length of the jogging track = 1/4 km = 0.25 km

The number of times Ali covered the track = 17

So,

Total distance covered by the Ali is given by,

Total distance = (Number of times he covered the track) x (Length of the track)

So,

The distance in kilometres covered by Ali is,

Distance = 0.25 x 17 = 4.25 km

Therefore, the distance covered by Ali is 4.25 km.

Explanation

First, find the daily meat consumption per lion:

500 kg / 20 lions / 7 days = 3.57 kg/lion/day

Now, calculate the total daily meat consumption for 14 lions:

3.57 kg/lion/day × 14 lions = 50 kg/day

Finally, determine how many days 200 kg of meat will last:

200 kg / 50 kg/day = 4 days

Explanation

Initial temperature = -13°C

Final temperature = 32°C

Total temperature rise = 32 - (-13)

= 32 + 13

= 45°C

Time elapsed = 9 hours (from 3:00 AM to noon)

Average hourly increase = Total temperature rise / Time elapsed

= 45°C / 9 hours

= 5°C/hour