7. Cost of 5 pizzas is Rs.725 and 6 pastries is Rs.54. If I want to purchase 3 pizzas and 12 pastries, how much should I pay?

ANSWER :

Cost of 5 pizzas = Rs.725

Cost of 6 pastries = Rs.54

So,

Cost of 1 pizza will be  

=

= Rs.145

Cost of 1 pastrie will be  

=

= Rs.9

To be found :-

The cost of 3 pizzas and 12 pastries

Cost of 3 pizzas will be

= 3 × 145

= Rs.435

Cost of 12 pastries will be

= 12 × 9

= Rs.108

Now,

Rs.435 + Rs.108 = Rs.543

Hence,

The cost of 3 pizzas and 12 pastries is Rs.543