Mrs Ang baked 9 cookies more than strudels. Each cookie needed 0.07 kg of flour while each strudel needed 0.5 kg of flour. She used 1.95 kg more flour for the strudels than for the cookies. How many cookies did Mrs Ang bake?
| |
Strudels |
Cookies |
Difference |
| Number |
1 u |
1 u + 9 |
|
| Value |
0.5 |
0.07 |
|
| Total value |
0.5 u |
0.07 u + 0.63 |
0.43 u - 0.63 |
Amount of flour needed for cookies
= 0.07 x (1 u + 9)
= 0.07 u + 0.63
Amount of more flour for the strudels than the cookies
= 0.5 u - (0.07 u + 0.63)
= 0.5 u - 0.07 u - 0.63
= 0.43 u - 0.63
0.43 u - 0.63 = 1.95
0.43 u = 1.95 + 0.63
0.43 u = 2.58
1 u = 2.58 ÷ 0.43 = 6
Number of cookies baked
= 1 u + 9
= 6 + 9
= 15
Answer(s): 15
