A number when added to 4 times to itself, gets equal to 10 times to its predecessor. Find the number.
Option:
a) 2
b)10
c) 8
d) 5
Solution
Let the Number is A
Predecessor of A = A – 1
A + 4 A = 10 (A – 1)
A + 4 A = 10 A – 10
11 = 6 A
5 A = 10 A – 10
5 A – 10 A = -10
5 A = 10
A = 2
Answer : a) 2