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September 17, 2014

September 17, 2014

Posted by **jo** on Sunday, August 21, 2011 at 7:16am.

How many pupils are there in the class?

How many sweets does Mr Neo have?

- Maths P5 -
**Henry**, Sunday, August 21, 2011 at 10:22pmX = The total # of sweets.

Y = The total # of pupils.

Eq1: x - 3y = 70.

Eq2: x -5y = -10.

Subtract Eq1 from Eq2 and get:

2y = 80,

Y = 40 Pupils.

In Eq1, substitute 40 for Y:

x - 3*40 = 70,

x - 120 = 70,

X = 70 + 120 = 190 Sweets.

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