Tao Nan School P6 Math CA1 2004 (Q46)

A skirt and 3 blouses cost $78. The skirt costs $p more than a blouse.
a) Express the cost of a blouse in term of p.
b) If p=10, how much is the cost of the skirt?

Solution


Skirt ----- 1 unit + $p
Blouse ----- 1 unit

Q(a)
Skirt + 3 blouses ----- $78
(1 unit + $p) + (3 units) ----- $78
4 units + $p ----- $78
4 units ------ $78 - $p
1 unit ----- $(78 – p)/4

Answer: The cost of a blouse is $(78 – p)/4

Q(b)
1 unit ----- $(78 – 10)/4 = $17

Skirt ----- 1 unit + p
= $17 + $10 = $27

Answer: The cost of the skirt is $27