RRB RPF RPSF SI and CONS Model Papers 10 with solutions

Question : 54 of 120

Marks: +1, -0

A boy was asked to multiply a number by 12. By mistake he multiplied the number by 21 and got his answer 63 more than the correct answer. The number to be multiplied was

Validate

Solution:

(1) Let required number be x.
According to the question,
21x – 12x = 63
⇒ 9x = 63
⇒ x

=63/9

= 7

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