$(100 - 52.8) - 7.2 = ?$

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Solution

The correct option is B
40

We know that,
$(x - y) - z = x - (y + z)$ , for all numbers $x$ , $y$ and $z$ .

Since, the above is true for all the numbers, it must be true for $x = 100$ , $y = 52.8$ and $z = 7.2$ .

So, $(100 - 52.8) - 7.2$
$= 100 - (52.8 + 7.2)$
$= 100 - 60 = 40$

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Question 19

In standard form 72 crore is written as:
(a) $72 \times 10^{7}$
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(c) $7.2 \times 10^{8}$
(d) $7.2 \times 10^{7}$

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