Question

Can you solve this step by step?

Answer 1

Answer:

110

Step-by-step explanation:

C.P of watch be x

C.P of wall clock be y

x + y = 390 --> a

10% of x + 15% of y = 51.50 ==> 10x + 15y = 5150 ==> 2x + 3y = 1030 --> b

solving a and b

x = 140 y = 250

y - x = 110

Answer 2

Let the cost price of watch be X and that of clock be Y.

Then, X + Y = 390------(1)

profit on watch =
$(x \times \frac{10}{100} ) = \frac{x}{10}$
profit on wall clock =
$y \times \frac{15}{100} = \frac{3y}{20}$
Total profit =
$\frac{x}{10} + \frac{3y}{20} = 51.50$
$\frac{2x + 3y}{1} = 1030$

$2x + 3(390 - x) = 1030$
using equation 1

x = 140
So Y = 390-140 = 250

Difference between their price = 250-140 = 110.