Let the number of sweets Mrs. Chua has be x
And the number of children be y
So,
x-8y=3 ------- 1️⃣
x-9y= -2 ------- 2️⃣
Change the signs of equation 2️⃣
x-8y=3
+x-9y=-2
- + +
__________
Substitute equation 3️⃣ in equation 1️⃣ :
Therefore, The total number of children i.e. y is 5 and the total number of sweets Mrs. Chua i.e. x is 43...
- The extra number of sweets required by Mrs. Chua is 2 because when each child gets 9 Mrs Chua has 2 sweets short...