abc = 137

10 Notice the first letter. One + Nine + Eight = ONE Two + Eight + Nine = TEN

18 eggs.

1 chicken lays 2 eggs in 3 days, so 3 chickens lay 3×2=6 eggs in 3 days. In 9 days, these 3 chickens lay 3 times as much eggs as in 3 days. Conclusion: three chickens lay 3×6=18 eggs in nine days.

67

100.


10 + 10 × 10 - 10

= 10 + 100 - 10

= 100

18 years.
You were 9 and Your sister was 1/3 of your age i.e her age was 3 years.

It means the difference between your ages was 9–3 = 6.

So now, when your sister is 12 years old then you must be 12+6 = 18 years old.
Again if you check the difference between your age and your sister's age that is 18–12 = 6.

So Your Age in this way is 18 Now.

100 steps.

Let v be the speed of the escalator, in steps per second. Let L be the number of steps that you need to take when the escalator stands still.

Upwards (along with the escalator), you walk 1 step per second. You need 50 steps, so that takes 50 seconds. This gives the following equation:

L steps - 50 seconds × v steps/second = 50 steps.
Downwards (against the direction of the escalator), you walk 5 steps per second. You need 125 steps, so that takes 25 seconds. This gives the following equation:

L steps + 25 seconds × v steps/second = 125 steps.
From the two equations follows: L = 100, v = 1. When the escalator stands still, you need 100 steps.

2
The first column totals 9. The second column totals 10. This pattern continues, so the final
column should total 13, by the addition of 2.

3

b) 50

Answer is both 1 and 9 whether your using PEMDAS or BODMAS

Z = 25.

Y + Y + Y = 120 => 3Y = 120 => Y = 40
X + 40 = 50 => X = 10
10 + Z = 35 => Z = 35 - 10 = 25