Question

19) a) In a 2-digit number, ten's digit is twice the unit digit. If the sum of the digits is 6 . Find
number.
b) Write the number 302 in generalized form.
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Answer 1

Answer:

(a) The number is 42.

Step-by-step explanation:

Let the number at tens place be x

and the number at ones place be y.

ACCORDING TO FIRST CONDITION,

x=2y.......(1)

ACCORDING TO SECOND CONDITION,

x+y=6.......(2)

From (1) and (2)

2y+y=6 --> 3y=6

Hence, y=2

and therefore, x=4

So the number is

42.

(b) 306=3x100 + 0x100 + 6x1.