x= 36 x 2
x = 72
Hence, the number is 72.
3 A number consists of two digits whose sum is 8. If 18 is added to the number
its digits are reversed. Find the number.
Let one's digit be x.
Since the sum of the digits is 8. Therefore, ten's digit = 8 - x.
Number = 10x (8 - x) + x = 80 - 10x + x = 80 - 9x
G
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Answer:
If an amount of money, P , the principal, is invested for a period of t years at an annual interest rate r, the amount of interest, I , earned is
I=Prt
where
I = interest
P = principal
r = rate
t = time
Interest earned according to this formula is called simple interest.