The lengths of the radii of circles form a geometric series. The radius of the first circle is 15cm. The radius decreases by of the length of the previous circle. Determine the total
area of all the circles in the series. Give your answer in terms of π​

step-by-step explanation:

this is not a question

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.