# Math Help - Primary 4 math's question 1

1. ## Primary 4 math's question 1

Sack A contains 4 times as much sugar as Sack B.
Desmond adds 0.2 kg of sugar to Sack A and 2.66 kg to sack B.
The amounts of sugar in the two sacks are now the same.
What was the mass of sugar in Sack B at first?
Give your answer in kg.

2. Originally Posted by mytan1963
Sack A contains 4 times as much sugar as Sack B.
Desmond adds 0.2 kg of sugar to Sack A and 2.66 kg to sack B.
The amounts of sugar in the two sacks are now the same.
What was the mass of sugar in Sack B at first?
Give your answer in kg.
A = 4B

0.2kg + A = 2.66kg + B

0.2kg + 4B = 2.66kg + B

3B = 2.46

B = 0.82kg

A = 3.28kg

3. Originally Posted by mytan1963
Sack A contains 4 times as much sugar as Sack B.
Desmond adds 0.2 kg of sugar to Sack A and 2.66 kg to sack B.
The amounts of sugar in the two sacks are now the same.
What was the mass of sugar in Sack B at first?
Give your answer in kg.
HI

Let the mass of sugar in sack B be x kg .

So the mass of sugar in sack A would be 4x since it's 4 times the mass of sugar in sack B.

Now $4x+0.2=x+2.66$

$3x=2.46$

$x=0.82$ kg