Question

During swimming practice,a boy swims 200 m on the 1st day and 20 m more every subsequent day .what distance did he swim on the 7th day?​

Answer 1

hii

the ans is 320

Step-by-step explanation:

this is a AP

the boy swims 200m on first day

220 ion second and so on

the given AP is

200, 220,240.......

here,

d=20

a=200

n=7

In AP

tn=a+(n-1)d

tn=200+ (7 - 1) 20

tn=200+ (6) 20

tn=200+ 120

tn=320

hence the boy swimmed 320m on 7th day

HOPE IT HELPS YOU