1.

Replace A, B, C by suitable numerals

Answer»

In tens place

6 – A = 3

Which implies that A ≤ 3

Now in units place

A – B = 7

This involves borrowing

∴ in tens place

6 – A -1 = 3

∴ A= 2

Now in units place

A + 10 – B = 7, where borrowing is involved

2 + 10 –B = 7

12 – B = 7

12-7 = B

∴ B= 5



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