21. What letter should replace A?
22. The baby is 30 weeks old. How old is the baby in months? Assume that there are 30 days in a month.
23. Four apples weigh 80 grams. Two apples and one pineapple weigh 80 grams. What is the weight of one pineapple?
24. One-half of Anton’s age this year plus one-half of his age two years ago is 9. How old is Anton this year?
25. Carl sells different kind of cheese in the town market. Below is a pictograph of Carl’s sales record. Each cheese in the pictograph weighs 2 kilograms.
What is the difference between the total weight of the Mozzarella sold and the total weight of the Goat cheese sold?