AA: Shopping mall in city A caused a lot troubles such as the closing of local business, stringent parking, and rising crime rate; therefore, city B should turn down the proposal for a new shopping center.

AI: As the standards on environmental control from the Scientists keep changing, a company should only follow the regulations from the government.

Math:

The ten's digit of number (positive integer) a is 6, what's the units digit of a^4?

a) a is an odd number

b) the units digit of a is not 5

Answer, need both of them.

A circle trail that's 15 feet wide, guy A runs at the inner circle while gal B runs at the outer edge of the circle, for 10 times, what is the difference they have run?

10*2*Pi*15

An appartment company have an average rent of 600$/mo, what's the percentage of their apprtments that are cheaper than 600.

a) 50% of the apprartments are cheaper than 500

b) they only have 4 types of units, 450, 550, 650, 800 respectively

Both of them together is not sufficient

3 people from each of the 6 companies, each would shake hands every person from another company, how many different hand shakes would take place?

9*C(2,6)=145