5年(nian)(nian)(nian)前天天的(de)年(nian)(nian)(nian)齡(ling)是玲(ling)(ling)玲(ling)(ling)年(nian)(nian)(nian)齡(ling)的(de)7倍，10年(nian)(nian)(nian)后天天年(nian)(nian)(nian)齡(ling)是玲(ling)(ling)玲(ling)(ling)年(nian)(nian)(nian)齡(ling)的(de)2倍，問今年(nian)(nian)(nian)天天、玲(ling)(ling)玲(ling)(ling)兩人各多少歲(sui)?

　　答案與解析:畫線段圖(tu)可以看出，因為10年后天天的年齡是玲(ling)(ling)玲(ling)(ling)年齡的2倍，所以兩人(ren)當時(shi)(shi)的年齡差為玲(ling)(ling)玲(ling)(ling)當時(shi)(shi)的年齡，即5+10+玲(ling)(ling)玲(ling)(ling)5年前(qian)的年齡。

　　因為5年(nian)(nian)(nian)前天(tian)天(tian)的年(nian)(nian)(nian)齡是玲(ling)(ling)(ling)玲(ling)(ling)(ling)年(nian)(nian)(nian)齡的7倍(bei)，兩(liang)人的年(nian)(nian)(nian)齡差為玲(ling)(ling)(ling)玲(ling)(ling)(ling)當時年(nian)(nian)(nian)齡的6倍(bei)。所以15相當于(yu)玲(ling)(ling)(ling)玲(ling)(ling)(ling)5年(nian)(nian)(nian)前年(nian)(nian)(nian)齡的5倍(bei)，可(ke)求出玲(ling)(ling)(ling)玲(ling)(ling)(ling)5年(nian)(nian)(nian)前的年(nian)(nian)(nian)齡。

　　解(jie)：(10+5)÷(7-1-1)=3(歲)

　　玲(ling)玲(ling)年(nian)齡?3+5=8(歲)

　　天天年齡3×7+5=26(歲)