Plz help i will reward right answers thanks

18 20p coins

Step-by-step explanation:

You can make two quick and easy equations for this that looks like:

10x + 20y = 420

x being the number of 10p coins and y being the 20p coins

3x = y

she has three times as many 20p coins as she has 10p

You can then substitute 3y in for x in the first equation shown and have:

10x + 20(3x) = 420 multiply out and simplify

10x + 60x

70x = 420

divide both sides by 70 for

x = 6

you have 6 10p coins

if she has 3 times as many 20p as 10p then she has

18 20p coins

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

christopher is 272,195 year old

step-by-step explanation: