Question

From the household expenses, A student saves rupees 5 in the first week, rupees 10 in second week, rupees 15 third week and so on. Then how much money he has saved after 15 week.
step by step ​

Answer 1

Answer:

225 is the answer.

i hope my answer should be correct .

please mark me as a brainlist.

Answer 2

s = n/2(2*a +(n-1)*d)

where s is the savings

n is the total number of days

a is the the first term (A.P)

d is the common difference

solution:

s =15/2(2*5+(15-1)*5)

s= 15/2(10+14*5)

s= 15/2(70+10)

s= 15/2+80)

s=15*80/2

s=15*40

s=600

show that total savings in 15 weeks is rupees 600