Factors of 70=
1x70 ; 2x35 ; 5x14 ; 7x10
Now, given that one factor is reduced by 2 and other increased by 4 to retain same value, we know that
7x10 changed to (7-2)x(10+4) i.e. 5x14.
As number of rows increased by 4, we can deduce from above that initially there were 10 rows.
Hence, Ans D
1x70 ; 2x35 ; 5x14 ; 7x10
Now, given that one factor is reduced by 2 and other increased by 4 to retain same value, we know that
7x10 changed to (7-2)x(10+4) i.e. 5x14.
As number of rows increased by 4, we can deduce from above that initially there were 10 rows.
Hence, Ans D
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