70% of the employees in a multinational corporation have VCD players, 75 percent have microwave ovens, 80 percent have ACs and 90 percent have washing machines. At least what percentage of employees has all four gadgets?  Answers.
A) (a) 15% B) (b) 5% C) (c) 10% D) (d) 20% E) (e) 25%
so 30% employees don't have VCD devices.   25% employees don't have MO   20% employees don't have ACs   10% employees don't have WM   Summ of employees that don't have some device = 30%+25%+20%+10% = 85% &lt; 100%   So definitely at least 15% employees have 4 devices.   ans: (a) 15%30 +25 +20 +10= 
<gadget id="calculator">30 +25 +20 +10</gadget>
<output>85</output>
85% &lt; 100%   So definitely at least 15% employees have 4 devices.   ans: (a) 15%
<result>A</result>
70% of the employees in a multinational corporation have VCD players, 75 percent have microwave ovens, 80 percent have ACs and 90 percent have washing machines. At least what percentage of employees has all four gadgets?