How to find a number if a given fraction of it?

@hennars (250)
United Arab Emirates
November 13, 2006 4:45am CST
1) In each of the following cases find the "money in the cash box" if, a) 15% of the money is $9. b) 0.28 of the money is $77 c)7/12 pf the money is $84 2) the bill that the accountant at a company had to pay for stationary used in March was$1,224.00.This was 153% of the money paid in February.How much money was paid in February for stationary? 3)Marie's mother gave her 0.21 of the money Marie had in her savings bank.This amounted to $14.70.How much money did Marie have in her savings bank?
2 responses
InaBee
@InaBee (58)
• Romania
13 Nov 06
I see the problems are different. So let's complete them: b) 0.28 = 77$ 77 1 = ------ = 44 0.28 2) 153% = 1224$ 100% = x 1224 X 100 x = ------------ = 800 153 3) 100% = 1 .... x 1 + 0.21 .... 14.7 14.7 X 100 x = ------------ 1.21
InaBee
@InaBee (58)
• Romania
13 Nov 06
:) Well, you think like this 15% of the sum is 9$ 100% is x Then x is 9 multiplied by 100 and divided with 15. In this case you obtain 60. Another example: c) 7/12 is 84$ 12/12 (1) is x x is 12 X 84 /7. this equals 144