You multiply the unit cost by the number of units. The product of y and 4 is 4y.
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To find out how many 5 pence coins are in 5 pounds, first convert pounds to pence. Since 1 pound equals 100 pence, 5 pounds equals 500 pence. Next, divide 500 pence by 5 pence: 500 ÷ 5 = 100. Therefore, there are 100 five-pence coins in 5 pounds.
If you have 50 pence left after spending 90% of your money, it means you spent 90 pence (since 90% of a pound is 90 pence). To find out how much money you started with, you need to calculate what 10% of the total amount would be. Since 10% is half of 20%, you can double the amount you have left, 50 pence, to get 100 pence. Therefore, you started with 1 pound.
To determine how many 50p coins are in £10.00, you first need to convert £10.00 into pence. Since there are 100 pence in a pound, £10.00 is equal to 1000 pence. Next, you divide 1000 pence by 50 pence to find out how many 50p coins are in £10.00. The answer is 20, so there are 20 50p coins in £10.00.
To determine how many yogurts you can buy with 5 pounds, you need to convert pounds to pence. Since 1 pound is equal to 100 pence, 5 pounds is equal to 500 pence. To find out how many yogurts you can buy, divide 500 pence by 45 pence per yogurt. Therefore, you can buy 11 yogurts with 5 pounds.
There are 100 pence in one pound. Therefore, there are 1000 pence in 10 pounds. To find out how many 10 pence coins are in 10 pounds, you simply divide 1000 by 10, which equals 100. So, there are 100 ten pence coins in 10 pounds.