Steps: 2 Marks
Answer: 1 Mark
Kareem's expense for 10 days $=Rs.230$
Kareem's expense for 1 day  $=\frac{230}{10}=Rs.23$
Ratio of Kareem's expenditure $=1:23$
Total amount left with Kareem $=Rs.345$
Number of days to finish $Rs.345$
$\Rightarrow \frac{345}{23}=15days$

Steps: 3 Marks
Answer: 1 Mark
Let x and y be the number of stamps Sonia and Surjeet have respectively.
At the end of one month,
Ratio of the stamps of Sonia to Surjeet
= x : y = 89 : 93
$\frac{x}{y}=\frac{89}{93}$
$x=y.\frac{89}{93}$
Given: y = 2325
$x=2325\times \frac{89}{93}$
 $x=\frac{2325\times 89}{93}=2225$

Hence Sonia has 2225 stamps.

a Part: 1 Mark
b Part: 1 Mark
c Part: 2 Marks
(a) Cost of 6 kg of wheat = Rs 72
 Cost of 1 kg of wheat $=\frac{72}{6}=Rs.12$
 Cost of 8 kg of wheat $=12\times 8$
 = $Rs.96$
(b) Cost of 5 kg of rice = Rs 450
Cost of 1 kg of rice $=\frac{450}{5}$ 
= $Rs.90$
     
(c) Ratio of price of 1kg of rice to 1kg of wheat
$\Rightarrow \frac{90}{12}=\frac{15}{2}=15:2$

Steps: 2 Marks
Answer: 2 Marks
Distance travelled by Neha's toy car in a minute = 288m
Speed of Neha's toy car = 288 m/min
Distance travelled by Vendetta's toy car in an hour (60 minutes) = 24.48km= 24480m  ($\Rightarrow$1km = 1000m)
Distance travelled by Vendetta's toy car in a minute= $24480÷60$ = 408 m
Speed of Vendetta's toy car=408 m/min
The ratio of the speed of the cars belonging to Neha and Vendetta =288 : 408 =12 : 17