You have 15 coins, that are quarters and dimes. The total value of the coins is $2.40. How many quarters and how many dimes do you have?

6 quarters, 9 dimes

Step-by-step explanation: So if one quarter equals 25 cents, and one dime equals ten the answer would be 9 dimes and 6 quarters. I know that you can fit 9 quarters in 2.40, but we have to add the dimes too and have 15 coins. So we now know that we can fit 6 quarters in 2.40 plus dimes. So 6*25=150, and we know that 6 quarters=1.50.  2.40-1.50=90, so 90 divided by ten equals 9.So, 6 quarters and 9 dimes.

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13

40 minutes

step-by-step explanation:

add the time and multiply by 2