Write three whole number just preceding $641000$.

Find the product using property.

$3485\times 5\times 782+697\times 25\times 218$

For numbers $a=20$, $b=11$,$c=8$, verify $(a-b)-c\ne a-(b-c)$.

A school canteen charges $₹35$ for lunch and $₹15$ for juice for each day. How much money is spent in all for $6$ days?