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### 6 Cards in this Set

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 Avg. 50units for n days. Adding 90units increases avg. to 55units. n = ? # added = sum2 - sum1 _________________________ 1) 90 = 55(n+1) - 50n 2) 5n = 35 A) n = 7 Avg. of 750 & 780 Avg.= [(n2 - n1)/2] + n1 _________________________ 1) 780-750 = 30 2) 30/2 = 15 A) 750+15 = 765 = Avg p students avg. is 70. q students avg. is 92. Combined avg. is 86. p/q = ? Combined Avg = (sum1+sum2)/(n1+n2) _________________________ 1) (70p+92q)/(p+q) = 86 2) 70p+92q = 86p+86q 3) 6q = 16p 4) 6q/16 = p A) p/q = 6/16 238*647 = ? (a) 143,734 (b) 152,736 (c) 153,734 (d) 153,986 (e) 155,737 Last Digit Method _________________________ 238 *647 -------- ...66 ...20 -------- ...86 >> 153,986 A) (d) 3.63*5.89 = ? (a)14.387 (b) 17.8934 (c) 21.3807 (d) 22.57 (e) 27.684 Last Digit Method & Decimal Spaces _________________________ 3.63 *5.89 --------- ......7 ......0 ......0 --------- ......7 >> which is going to be 4 places to the right of the decimal point because 3.63 & 5.89 each have 2 placeholders to the right of the decimal for a total of 4. A) (c) is the only choice with a 7 in the ten thousands place. 3.63*5.80 = ? (a)21.0054 (b) 17.8934 (c) 21.054 (d) 22.57 (e) 27.684 Last Digit Method & Decimal Spaces w/ zero as a place holder _________________________ 3.63 *5.80 --------- ......0 ....40 ...500 --------- ...540 >> which is going to have 3 decimal places because 3.63 has 2 placeholders to the right of the decimal and 5.8 only has 1 placeholder. A) (c) is the only choice with a 5 in the hundreds place and a 4 in the ten thousands place; zero does not hold a place when it is on the far right of the decimal point.