Molly opened a bank account she deposited $86.50 into her account every month for 20 months she used $24.50 every month to pay for singing lessons after 20 months she used 1/4 of the total money left in her account to go to summer camp for singers what is the total amount of money Molly spent to go to the summer camp

For 20 months, Molly deposited $86.50, so she deposited a total of 86.5 * 20, namely 1730 bucks.

now, every month she deflated her account by $24.50 to pay for her singing lessons, she did that every month, namely for 20 months so she deflated the account balance by 24.5 * 20, or 490 bucks.

so, she deposited 1730 and deflated it by 490, 1730 - 490 = 1240, that's all that's left in the account.

for the Summer Camp, she spent 1/4 of that, what's a quarter of that? well is just their product, (1/4) * 1240.