Out of 50 students in a class, 10 students like Maths but not Science and 15 students like Science but not Maths. If 10 students like neither of both subjects; (i) show the above information in a Venn-diagram
(ii)find the ratio of the students who like Maths to the students who like Science.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.