3 把椅子和 5 张桌子的价格是 $360。6 把椅子和 15 张桌子的价格是 $900。1 张桌子的价格是多少？（答案四舍五入到最接近的 $10。）答案：$ ___

它不会直接告诉你答案，而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的

完整解法

1. Set up equations for the given scenarios

Let $c$ be the cost of 1 chair and $t$ be the cost of 1 table.
$3c + 5t = 360$ --- (1)
$6c + 15t = 900$ --- (2)

2. Eliminate $c$ to find $t$

Multiply equation (1) by 2:
$6c + 10t = 720$ --- (3)

Subtract equation (3) from equation (2):
$(6c + 15t) - (6c + 10t) = 900 - 720$
$5t = 180$
$t = 36$

3. Round off the answer to the nearest $10

$36 \approx 40$ (to the nearest 10)

答案

$40

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