Question 244163: Mona paid $1.45 for 5 pounds of bananas. How much would 7 pounds of bananas? Found 2 solutions by checkley77, JimboP1977:Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! 1.45/5=X/7 cross multiply.
5X=7*1.45
5X=10.15
X=10.15/5
X=$2.03 ANS. FOR 7 BANANAS.
PROOF:
1.45/5=2.03/7
10.15=10.15
You can put this solution on YOUR website! Maths is all about patterns and relationships between numbers. We have a relationship between how much Mona paid for the bananas and the weight. Let us call this relationship "x".
1.45 times x = 5 pounds of bananas. So we know that there is a mystery number that when times by 1.45 gives 5. But how do we find this mystery x? Well we need to move the 1.45 from the left side to the right of equals sign. We do this by doing the reverse of what is happening on the left side and repeating it on the right side. What is the opposite of multiply? It is divide. So if we divide both sides by 1.45 we get:
x = 5 divided by 1.45
So we know that the relationship between the price and the amount is
So the questions is how much does 7 pounds of bananas cost?
$y times by (5/1.45) = 7
So we need to know what the price y is so we need to move the (5/1.45) from the left side to the right by dividing both sides by (5/1.45) to give
So the price y is $2.03 for 7 pounds of bananas.
Another way of looking at it is to to say that the weight as increased by 7/5 ths so the price must increase be the same fractions.
Does that make any sense? Let me know!
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