Question

Salma is practising for her school sports day. She runs in the morning and in the evening. In the morning she runs 9.990 km. If she runs in all 11.111 km, then find the distance she runs in the evening.

• A. $1.111$ km
• B. $1.121$ km
• C. $1.99$ km
• D. $1.191$ km

Answer 1

The correct option is B $1.121$ km

Here, first we convert the given values into like fractions having the denominator as $1000$.
$9.990=\frac{9990}{1000}$ [She runs in the morning]

$11.111=\frac{11111}{1000}$ [She runs in all]


She runs in the evening:

$11.111-9.990=\frac{11111}{1000}-\frac{9990}{1000}$

$=\frac{11111-9990}{1000}$

$=\frac{1121}{1000}=1.121$

Therefore, 1.121 km she runs in the evening.