Math in grocery shopping

Algebra Level 1

If you spent exactly $10.50 in a grocery shop buying 9 pencils and 6 pens, and pencils are $0.50 a piece, how much will two pens cost (in dollars)?

1 0.5 2 4 2.1

Margaret Zheng by Margaret Zheng , 20, USA

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4 solutions

Hung Woei Neoh
May 8, 2016

1 1 pencil costs $ 0.50 \$0.50 , 9 9 pencils cost 9 × $ 0.50 = $ 4.50 9 \times \$0.50 = \$ 4.50

Therefore, 6 6 pens cost $ 10.50 − $ 4.50 = $ 6.00 \$10.50 - \$4.50 = \$6.00

A pen costs $ 6.00 ÷ 6 = $ 1.00 \$6.00 \div 6 = \$1.00

Two pens will then cost $ 1.00 × 2 = $ 2.00 \$1.00 \times 2 = \boxed{\$2.00}

6 Helpful 2 Interesting 3 Brilliant 1 Confused
Sonia Gupta
May 9, 2016

Did the same as you guys have done.

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Hana Wehbi
May 8, 2016

The price of 9 pencils=$ (9 × 0.5= 4.5). Now $( 10.5- 4.5= 6) is the price of 6 pens; Thus the price of two pens= ( 6/6)*2= $2 .

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Margaret Zheng
May 8, 2016

Relevant wiki: Decimals

We can see that you spent 10.5 − 9 × 0.5 = 6 10.5 - 9 \times 0.5 = 6 dollars on 6 pens. Therefore, 2 pens will cost you 2 dollars.

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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