Answer: 5 pens
Explanation:
FACTS:
andrea has $20.
She bought:
4 paper pads for $1.19 each
3 notebooks for $1.89 each
1 book for $4.95
Will use the remaining money to buy pens that cost 79 cents ($0.79) each.
How many pens can she buy?
Step 1: Find how much she spent on the paper pads
1.19x4= 4.76
Ans= $4.76
Step 2: Find how much she spent on notebooks
3x1.89=$5.67
Ans= $5.67
Step 3: Find how much she has spent so far.
4.76 + 5.67 +4.95= $15.38
Step 4; Find how much she has left.
20-15.38= 4.62
Step 5: Find the number of pens she can buy.
She has $4.62 to buy pens that cost $0.79 (79 cents) each. how many pens can she buy?
To solve this, divide 4.62÷0.79. the decimal makes no difference in what operation you do.
4.62÷0.79= 5.84810126582 which rounds to 5.8 which rounds to 6.
Step 6: Check
REMEMBER:
pens cost $0.79 each
we're assuming she got 6 pens
in order for 6 to be correct, 6x0.79 MUST equal 4.62 or less because that's how money she had to spend on pens.
0.79x6= 4.74. It's wrong. In this case, it's always the number that comes before it, in this case 5.
Even though 5x0.79= 3.95 which is less than 4.62, it must be correct because it makes so much more sense to have some money left than spend more than what you even have. In questions like this, don't always rely on rounding.
Answer= 5 pens