Question

for which value of n are the nth terms of two aps 60,62,64---and -10,-3,4,11---equal

Answer 1

here the n value is same. so take nth=n.Then a+d(n-1)=A+D(n-1).
60+2(n-1)=-10+7(n-1)
75=5n
n=15
so, 15th term is same for both the AP's

Answer 2

a+(n-1)d=A+(N-1)D
60+(n-1)2=-10+(n-1)7
60+2n-2=10+7n-7
58+2n=3+7n
55=5n
n=11