Same pattern as Working backwards. New numbers, new story. Try each one on paper, then check the working below — or watch it drawn out, the same way the problem above is.
Question 1
Su Ann and Kimberly had 420 origami cranes altogether. Su Ann gave 75% of her origami cranes to Kimberly. Kimberly then gave 50% of her origami cranes to Su Ann. In the end, Su Ann had 250 origami cranes. How many origami cranes did Kimberly have at first?
Work it out on paper, then check below. ▶ See the working
Question 2
Kai Xuan and Zi Yang had 410 marbles altogether. Kai Xuan gave 40% of his marbles to Zi Yang. Zi Yang then gave 50% of his marbles to Kai Xuan. In the end, Kai Xuan had 274 marbles. How many marbles did Zi Yang have at first?
Work it out on paper, then check below. ▶ See the working
Question 3
Kai Xuan and Zi Yang had 440 marbles altogether. Kai Xuan gave 50% of his marbles to Zi Yang. Zi Yang then gave 50% of his marbles to Kai Xuan. In the end, Kai Xuan had 280 marbles. How many marbles did Zi Yang have at first?
Work it out on paper, then check below. ▶ See the working
Question 4
Wei Jie and Farhan had 440 canteen vouchers altogether. Wei Jie gave 50% of his canteen vouchers to Farhan. Farhan then gave 50% of his canteen vouchers to Wei Jie. In the end, Wei Jie had 280 canteen vouchers. How many canteen vouchers did Farhan have at first?
Work it out on paper, then check below. ▶ See the working
Question 5
Wei Jie and Farhan had 610 canteen vouchers altogether. Wei Jie gave 40% of his canteen vouchers to Farhan. Farhan then gave 50% of his canteen vouchers to Wei Jie. In the end, Wei Jie had 416 canteen vouchers. How many canteen vouchers did Farhan have at first?
Work it out on paper, then check below. ▶ See the working