Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

The cost of each table is $110.

Given that

There are five items i.e. chair, bookshelf, 2 tables, and a desk.

The total amount incurred for these 5 items should be $900.

And, the chair + desk = 70% of total.

The cost of the bookshelf is $50.

Since 70% of total = chair + desk

That means

Chair + desk = 0.70 of $900 = $630

So the other items cost should be

= $900 - $630

= $270

And, the cost of bookshelf is $50

So, the two tables cost should be

= $270 - $50

= $220

So for one it should be

= $220 ÷ 2

= $110

Therefore we can conclude that the cost of each table is $110.

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Find  the cost of the chair and desk by multiplying the total amount pent by the 70%

Chair and desk = 900 x 0.70 = $60

Subtract that cost from the total spent:

900 - 630 = $270 was spent on the other three items.

Subtract the cost of the bookshelf:

270 - 50 = 220

The two tables cost 220.

For the price of one table divide that cost by 2:

220/2 = 110

One table cost $110.

if x decreases by 4 then y increases by 10

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