Forty students watched films A, B and C over a week. Each student watched either only one film or all three. Thirteen students watched film A, sixteen students watched film B and nineteen students watched film C. How many students watched all three films?
4
The sum 13 + 16 + 19 = 48 counts every one-film student once and every three-film student three times. Relative to 40 students, the extra count is twice the all-three group:
\(2x=48-40=8\Rightarrow x=4\)
Important Questions from Numerical Computation
If \({\left( {z + \frac{1}{z}} \right)^2} = 98\), compute \(\left( {{z^2} + 1/\;{z^2}\;} \right)\)
- In the context of measures of surfaces, which one of the following is $not$ correct?
Ratio of the angles of a triangle are 1 : 2 : 6. What is the smallest angle?
Two design consultants, P and Q, started working from 8 AM for a client. The client budgeted a total of USD 3000 for the consultants. P stopped working when the hour hand moved by 210 degrees on the clock. Q stopped working when the hour hand moved by 240 degrees. P took two tea breaks of 15 minutes each during her shift, but took no lunch break. Q took only one lunch break for 20 minutes, but no tea breaks. The market rate for consultants is USD 200 per hour and breaks are not paid. After paying the consultants, the client shall have USD_remaining in the budget.
Leila aspires to buy a car worth Rs. 10,00,000 after 5 years. What is the minimum amount in Rupees that she should deposit now in a bank which offers 10% annual rate of interest, if the interest was compounded annually?
