## Question

primary 5 | Maths | Whole Numbers

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##### Trustin Chew

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Date Posted: 8 months ago
Views: 81
Eric Nicholas K
8 months ago
5 dresses and 8 shirts cost \$1709.
3 shirts cost \$75 less than 1 dress.

For every 3 shirts sold, the price is \$75 less than 1 dress. This is counted as one set. For every 15 shirts sold (5 sets), the price is \$75 x 5 = \$375 less than 5 dresses.

Let’s pretend the person buys 15 new shirts instead of the 5 dresses. He would have paid \$375 less, or \$1709 - \$375 = \$1334. This is the amount for a total of 23 shirts (8 shirts + 15 new shirts).

23 shirts = \$1334
1 shirt = \$1334 / 23 = \$58

So 1 shirt costs \$58.
Snell
8 months ago
method 1
3 s + 75 = 1 d
15 s + 375 = 5 d

5 d + 8 s = 1709
15 s + 375 + 8 s = 1709
1 s = \$58

method 2
unit cost
s: 1u
d: 3u + 75

5 x (3u+75) + 8 x 1u = 1709
u = 58

cost of 1 shirt is \$58

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Trustin Chew
8 months ago
Thank you