Question

a computer shop display a total of 50 type A and type B mice.the cost of type A mouse is Rs 6 and that of type B mouse is Rs 13.if total cost of both mice is Rs 433 find number of type A mice displayed.

Answer 1

Let type A = x and type b = y; so

x + y = 50 which implies that y = 50-x

now, 6x + 13y = 433

add the value of y

6x + 13 (50-x) = 433

6x + 650- 13x = 433

-7x = -217

x = 217/7

=31

Answer 2

Let type A = x and type b = y; so x + y = 50 which implies that y = 50-x now, 6x + 13y = 433 add the value of y 6x + 13 (50-x) = 433 6x + 650- 13x = 433 -7x = -217 x = 217/7 =31