Question

Two chocolates three milk shakes and four cakes cost Rs.190. Four chocolates and eight cakes cost Rs.320. Find the cost of a milkshake.(In Rs.) Select one:

Answer 1

2 chocolates+3 shake+4cake=rs190
4chocolates+8cake=rs320
2chocolates+4cakes=rs160------(1)

3milk shake=190-160=30
1milk shake=10

hope this may help you

Answer 2

Let's assume every chocolate costs Rs. x , every milkshake costs Rs. y and every cake costs Rs. z.

Thus from the question we get;

2x + 3y + 4z = 190 --------- A

4x + 8z = 320 --------- B

or, 2 ( 2x + 4z ) = 320

or, 2x + 4z = 160 ---------C

Putting the values got from equation C in equation A;

3y + ( 2x + 4z ) = 190

or, 3y = 190 - 160

or, y = 10

Therefore, the cost of one milkshake is Rs. 10