How many marbles?
Sophie had a certain number of marbles. She gave half of them to Jack. Then, she gave 12 more marbles to Lily. Now she has 16 marbles left.
How many marbles did Sophie have at the beginning?
Word Problem
A bridge is built across a river. One quarter of the bridge is over the left bank of the river and one third of the bridge is over the right bank. The river is 120 m wide. How long is the bridge?
Let’s work backwards from what she has now.
ReplyDeleteShe has 16 marbles left after giving 12 to Lily.
So before giving 12 to Lily, she had:
16 + 12 = 28 marbles
She had 28 marbles after giving half to Jack.
That means 28 marbles = half of her original total.
So the total she started with is:
28 × 2 = 56 marbles